G2 SEC examination performance depends on carrying state across interruptions without carrying the whole problem in working memory. A useful checkpoint compresses the current state into the smallest set of cues needed to resume accurately.
This one-hundredth Learner’s Guide develops checkpoint compression across K200 English, K210 Mathematics and K223–K225 Science. It extends Vol 0066 Return Protocol and Vol 0076 Uncertainty Quarantine.
The checkpoint format
- Known: what is already secure?
- Blocked: what exact uncertainty stops progress?
- Next: what is the first useful action on return?
- Dependency: what later work inherits this state?
- Closure: what marker will be cleared once resolved?
1. English passage checkpoint
Situation: You finish a passage before questions.
Compressed state: Compress who, what changed, major contrast and unresolved reference into a few cues; do not retell the whole passage.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
2. English paragraph checkpoint
Situation: A dense paragraph has several claims.
Compressed state: Store topic, turn and decisive evidence so later rereading starts locally.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
3. English source checkpoint
Situation: Two texts are active.
Compressed state: Store one-line stance and source label for each to prevent ownership drift.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
4. English character checkpoint
Situation: A character changes attitude.
Compressed state: Store before-state, trigger and after-state rather than a long narrative memory.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
5. English chronology checkpoint
Situation: Several events matter.
Compressed state: Record only the order needed for motive and inference questions.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
6. English referent checkpoint
Situation: A pronoun remains uncertain.
Compressed state: Store candidate A/B and the sentence that can resolve it.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
7. English vocabulary checkpoint
Situation: One word is unresolved.
Compressed state: Store local sentence meaning and move; do not keep the whole paragraph active.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
8. English inference checkpoint
Situation: An inference is plausible but fragile.
Compressed state: Store evidence phrase plus bounded conclusion.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
9. English summary checkpoint
Situation: Several points are selected.
Compressed state: Store unique point labels and source zones, not full sentences.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
10. English writing checkpoint
Situation: A paragraph is drafted.
Compressed state: Store paragraph purpose and next move before editing a sentence.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
11. English oral checkpoint
Situation: Preparation time is ending.
Compressed state: Store three idea cues, not scripted paragraphs.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
12. English listening checkpoint
Situation: One detail is missed.
Compressed state: Mark gap and re-enter audio; do not rehearse the missed phrase mentally.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
13. Mathematics question checkpoint
Situation: A multi-step problem is paused.
Compressed state: Store target, known values, current relation and next operation.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
14. Mathematics algebra checkpoint
Situation: Working is long.
Compressed state: Box the latest verified equation so return begins there.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
15. Mathematics graph checkpoint
Situation: A graph question has several readings.
Compressed state: Store axis scale, target interval and values already read.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
16. Mathematics geometry checkpoint
Situation: A diagram has many labels.
Compressed state: Store the theorem/relationship currently unlocking the target.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
17. Mathematics probability checkpoint
Situation: A tree or sample space is incomplete.
Compressed state: Store event universe and branch state.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
18. Mathematics ratio checkpoint
Situation: Several quantities are related.
Compressed state: Store base quantity and ratio orientation.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
19. Mathematics percentage checkpoint
Situation: A calculation is paused.
Compressed state: Store denominator/base and whether change is increase, decrease or share.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
20. Mathematics unit checkpoint
Situation: Conversions are active.
Compressed state: Store common target unit and last verified converted value.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
21. Mathematics case checkpoint
Situation: Several branches exist.
Compressed state: Mark completed, impossible and unresolved cases.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
22. Mathematics dependency checkpoint
Situation: An intermediate value feeds later work.
Compressed state: Box it and mark descendants rather than remembering mentally.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
23. Mathematics constraint checkpoint
Situation: A decimal solution needs context.
Compressed state: Store raw value plus minimum/maximum/integer condition.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
24. Mathematics verification checkpoint
Situation: A result needs checking.
Compressed state: Store the chosen independent check, not a vague ‘check later’.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
25. Science experiment checkpoint
Situation: A long setup is described.
Compressed state: Store changed, measured and key controlled variables.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
26. Science data checkpoint
Situation: A table is dense.
Compressed state: Store condition ownership, trend and anomaly.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
27. Science graph checkpoint
Situation: Several intervals behave differently.
Compressed state: Store the requested interval and local trend.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
28. Science mechanism checkpoint
Situation: A causal explanation is incomplete.
Compressed state: Store cause → missing link → outcome.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
29. Science model checkpoint
Situation: Prediction and data differ.
Compressed state: Store model prediction, observed result and suspected assumption.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
30. Science control checkpoint
Situation: Several controls are described.
Compressed state: Store what alternative each control removes.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
31. Science negative-evidence checkpoint
Situation: Expected signal is absent.
Compressed state: Store expected result, detection capability and bounded conclusion.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
32. Science diagnostic checkpoint
Situation: Test result is ambiguous.
Compressed state: Store target, signal, false-positive route and false-negative route.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
33. Science scale checkpoint
Situation: Mechanism and observation are at different levels.
Compressed state: Store local mechanism, aggregate observation and missing bridge.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
34. Science repeatability checkpoint
Situation: Repeated readings vary.
Compressed state: Store centre, spread and any anomaly.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
35. Science evaluation checkpoint
Situation: A flaw is identified.
Compressed state: Store flaw → consequence → targeted improvement.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
36. Section checkpoint
Situation: A section ends.
Compressed state: Close unresolved items, record return priorities and clear section-specific rules.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
37. Paper checkpoint
Situation: Half the paper is complete.
Compressed state: Compare actual progress with plan using counts and marks, not emotion.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
38. Time checkpoint
Situation: A scheduled clock check arrives.
Compressed state: Store remaining time, remaining work and one pacing adjustment.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
39. Return checkpoint
Situation: You are about to leave a question.
Compressed state: Write known, blocked and next.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
40. Resume checkpoint
Situation: You return later.
Compressed state: Read the stored state before rereading the whole question.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
41. Review checkpoint
Situation: A question is complete but fragile.
Compressed state: Store the exact risk: sign, source, unit, denominator, scope or mechanism.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
42. Confidence checkpoint
Situation: You feel uncertain.
Compressed state: Translate feeling into a named check or close the answer.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
43. Instruction checkpoint
Situation: A new section begins.
Compressed state: Store active global rules plus new local rule.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
44. Choice checkpoint
Situation: An optional question is selected.
Compressed state: Store the chosen option and close the alternative.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
45. MCQ checkpoint
Situation: Two options remain.
Compressed state: Store the feature separating them.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
46. Calculation checkpoint
Situation: Calculator work is interrupted.
Compressed state: Store typed expression or last verified value to avoid re-entry drift.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
47. Transfer checkpoint
Situation: Scratch work must move to final response.
Compressed state: Store exact final value, unit and accuracy before copying.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
48. Error checkpoint
Situation: A mistake is found.
Compressed state: Store first broken node and dependent branches.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
49. Repair checkpoint
Situation: A correction is completed.
Compressed state: Store new verified state and clear old uncertainty marker.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
50. Anomaly checkpoint
Situation: One result looks strange.
Compressed state: Store why it is strange and what test would distinguish error from real exception.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
51. Assumption checkpoint
Situation: A model uses an unstated condition.
Compressed state: Write the assumption explicitly before continuing.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
52. Boundary checkpoint
Situation: A claim is valid only in a range.
Compressed state: Store range/condition beside the claim.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
53. Source checkpoint
Situation: Evidence changes source.
Compressed state: Mark source boundary before inference.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
54. Population checkpoint
Situation: Data refer to subgroup.
Compressed state: Store the relevant universe to prevent denominator drift.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
55. Denominator checkpoint
Situation: A rate is paused.
Compressed state: Write denominator in words.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
56. Unit checkpoint
Situation: A quantitative branch is paused.
Compressed state: Write quantity type and target unit.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
57. Sign checkpoint
Situation: Direction matters.
Compressed state: Mark the sign-bearing step.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
58. Scope checkpoint
Situation: English wording is fragile.
Compressed state: Store quantifier/modality that must survive paraphrase.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
59. Causality checkpoint
Situation: A cause is proposed.
Compressed state: Store cause, effect, direction and alternative explanation.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
60. Comparison checkpoint
Situation: Two entities are active.
Compressed state: Store the common criterion before writing differences.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
61. Minimum-sufficient checkpoint
Situation: An answer feels complete.
Compressed state: Check command, count, support, scope and stop condition.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
62. Interface checkpoint
Situation: A response is ready.
Compressed state: Check number, label, unit, source and final form.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
63. One-minute checkpoint
Situation: Very little time remains.
Compressed state: Store only recoverable targets: blanks, units, labels, selections and one-step repairs.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
64. End-of-paper checkpoint
Situation: Submission is near.
Compressed state: Clear accidental blanks and ambiguous final states before deep re-solving.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
65. Practice checkpoint
Situation: A mock question is marked.
Compressed state: Store first failure point and repair cue, not only score.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
66. Study checkpoint
Situation: A session ends.
Compressed state: Store what is stable, what remains fragile and the first retrieval task for next session.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
67. Transfer checkpoint after repair
Situation: A skill has been fixed once.
Compressed state: Store the deep rule and retest on changed surface.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
68. Repeated-error checkpoint
Situation: Same failure appears again.
Compressed state: Promote from local note to cross-topic repair target.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
69. Stable-skill checkpoint
Situation: Fresh transfer succeeds repeatedly.
Compressed state: Reduce monitoring frequency and free attention for weaker skills.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
70. Checkpoint overload
Situation: Too many notes accumulate.
Compressed state: Keep only state needed to resume or verify; compression must reduce load.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
71. Checkpoint ambiguity
Situation: A marker says only ‘?’.
Compressed state: Replace with exact block and next action.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
72. Checkpoint closure
Situation: The stored state is resolved.
Compressed state: Delete or cross out the uncertainty cue so it stops consuming attention.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
73. Final checkpoint rule
Situation: A checkpoint should make future thinking cheaper.
Compressed state: If the note requires reconstructing the whole problem, it did not compress enough.
For practice, leave the task for several minutes, then return using only the checkpoint. If you must reread everything, the checkpoint is too vague. If the checkpoint contains nearly the whole question, it is too large. The target is the minimum state that restores accurate action.
Checkpoint compression is not note-taking
Ordinary notes may preserve information for later study. Examination checkpoints preserve operational state for a near-future return. They should therefore privilege dependencies, uncertainty and next action over completeness.
Links
Use the Examination Craft hub, Vol 0096 Response-Interface Integrity, the relevant English, Mathematics and Science hubs, and the PSLE Learner’s Guide.
Official-source discipline
For the 2027 SEC G2 school-candidate framework, use the current SEAB G2 syllabus directory and linked subject syllabuses. SEAB lists K200 English Language, K210 Mathematics and K223–K225 Science combinations. Checkpoint compression is an eduKateSengkang training framework, not an SEAB instruction.
Final rule
A checkpoint should make future thinking cheaper. Store what is known, what is blocked and what happens next. Then leave the question without carrying its entire state in your head.
