The 20-route learning estate
eduKateSengkang is organised as a Learning Castle: existing subject hubs, level routes, examination routes and learning-system pages retain their jobs. This page is the master upgrade directory. It does not replace those owners. It makes the work visible, assigns every upgrade to one route, and gives new or substantially revised articles stable IDs so later batches can be connected without losing track of what is complete.
Numbering rule
Each route has a -000 hub pointer. Article slots then use reserved tens: -010, -020, -030 and so on. The first upgrade programme reserves up to 150 article slots per route, ending at -1500. Existing high-value URLs are upgraded in place wherever practical; the ID identifies the editorial job, not a requirement to create a new URL.
| Route | Hub ID | Primary job | Existing owner / destination | Reserved article IDs | Status |
|---|---|---|---|---|---|
| SK-01 | SK-01-000 | Homepage, Sengkang Tuition, commercial/navigation/root accuracy | Homepage / Tuition Centre owner | SK-01-010–SK-01-1500 | OPEN |
| SK-02 | SK-02-000 | Primary 1–3 English | Primary English Learning Hub | SK-02-010–SK-02-1500 | OPEN |
| SK-03 | SK-03-000 | Primary 4–6 English + PSLE English | Primary English Learning Hub / PSLE Learning Guide | SK-03-010–SK-03-1500 | OPEN |
| SK-04 | SK-04-000 | Secondary 1–2 English | English Hub | SK-04-010–SK-04-1500 | OPEN |
| SK-05 | SK-05-000 | Secondary 3–4 English + SEC English | English Hub | SK-05-010–SK-05-1500 | OPEN |
| SK-06 | SK-06-000 | Vocabulary, grammar, reading, writing and English skills | Complete English Index | SK-06-010–SK-06-1500 | OPEN |
| SK-07 | SK-07-000 | Primary 1–3 Mathematics | Mathematics Hub | SK-07-010–SK-07-1500 | OPEN |
| SK-08 | SK-08-000 | Primary 4–6 Mathematics + PSLE Mathematics | Mathematics Hub / PSLE Learning Guide | SK-08-010–SK-08-1500 | OPEN |
| SK-09 | SK-09-000 | Secondary 1–2 Mathematics | Mathematics Hub | SK-09-010–SK-09-1500 | OPEN |
| SK-10 | SK-10-000 | Secondary 3–4 Mathematics + SEC Mathematics | Mathematics Hub | SK-10-010–SK-10-1500 | OPEN |
| SK-11 | SK-11-000 | Additional Mathematics | Additional Mathematics owner | SK-11-010–SK-11-1500 | OPEN |
| SK-12 | SK-12-000 | Primary 3–4 Science | Science Hub | SK-12-010–SK-12-1500 | OPEN |
| SK-13 | SK-13-000 | Primary 5–6 Science + PSLE Science | Science Hub / PSLE Science Learning Guide | SK-13-010–SK-13-1500 | OPEN |
| SK-14 | SK-14-000 | Secondary Science + scientific reasoning | Science Hub | SK-14-010–SK-14-1500 | OPEN |
| SK-15 | SK-15-000 | Learning Castle, Learning Runtime and study methods | Learning Runtime Hub | SK-15-010–SK-15-1500 | OPEN |
| SK-16 | SK-16-000 | Examination performance, revision, assessment and error repair | Examination Craft | SK-16-010–SK-16-1500 | OPEN |
| SK-17 | SK-17-000 | Parent guides, tuition, teaching and student support | Parents’ Guide | SK-17-010–SK-17-1500 | OPEN |
| SK-18 | SK-18-000 | Algorithms, computing and advanced mathematics | Algorithms & Computing Hub | SK-18-010–SK-18-1500 | OPEN |
| SK-19 | SK-19-000 | Advanced science and world-knowledge science material | Complete Science Index | SK-19-010–SK-19-1500 | OPEN |
| SK-20 | SK-20-000 | Estate archaeology: duplication, location leakage, orphan control, cannibalisation and consolidation candidates | Learning Castle Registry | SK-20-010–SK-20-1500 | OPEN |
Article register
The first-wave titles and status ledger are live in the eduKate Sengkang Article Register | SK-01 to SK-20. Use it to claim the next article ID, see protected owners and avoid duplicating work already active in another branch.
Protection-first reader standard
All 20 branches now follow the eduKate Sengkang Reader Experience Standard: protect strong pages, connect isolated pages, improve formatting only where it helps, use bounded surgery for specific defects, and modernise only when the existing article no longer completes its reader job.
Article state
Every inspected URL receives one state before work begins: PROTECT for ranking or strategically sensitive owners; KEEP for sound pages needing no substantial rewrite; MODERNISE for useful but outdated pages; SURGERY for small bounded repairs; RETARGET for pages that need a distinct adjacent search job; CONSOLIDATION CANDIDATE for overlapping intent that requires owner review; LOCATION LEAKAGE for misplaced locality; or HISTORICAL for material worth preserving without major reinvestment.
Completion rule
An article ID becomes complete only when the assigned existing URL or new article has a defined reader job, correct owner, current factual scope, useful internal return path and no unresolved collision with another Sengkang owner. A branch can therefore inspect more than 150 URLs without rewriting 150 pages. The 150 slots are a controlled first-wave capacity, not a quota.
Castle relationship
This programme sits under the existing Learning Castle and follows its one-owner-many-routes rule. English, Mathematics, Science, Examination Craft, Learning Runtime and Algorithms retain their existing canonical roles. The master directory exists to coordinate upgrades and make unfinished work visible; it does not create twenty competing subject hubs.
Complete-index crosswalk
Use the 20 routes above to decide ownership and upgrade work. Use these Complete Archives when the job is enumeration, orphan control or direct deep-article discovery.
English Archive · Mathematics Archive · Science Archive · Examination Archive · Learning Runtime Archive · Algorithms & Computing Archive
Deep fallback discovery
The subject hubs and Complete Archives remain the preferred routes. These live indexes are the final orphan-control layer: they expose every published Page and Post through paginated internal links so newly published or unusually placed content still has a crawlable return path while specialist routing is updated.
Browse every published Page
2756 results found
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Primary 4 Mathematics Learning Guide | Angles, Protractor Reading, Symmetry and Spatial Construction
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Primary 4 Mathematics Learning Guide | Area, Perimeter, Angles, Symmetry and Nets
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Primary 4 Mathematics Learning Guide | Assumption Method: Supposition, Excess, Difference and Word Problems
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Primary 4 Mathematics Learning Guide | Before-and-After Problems: Unknown Start, Change and Final Quantity
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Primary 4 Mathematics Learning Guide | Composite Figures, Missing Lengths and Boundary Tracing
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Primary 4 Mathematics Learning Guide | Constant Difference: Equal Changes, Comparison and the Gap That Stays the Same
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Primary 4 Mathematics Learning Guide | Constant Total: Transfers, Redistribution and the Quantity That Does Not Change
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Primary 4 Mathematics Learning Guide | Data, Word Problems, Strategy Choice and Self-Checking
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Primary 4 Mathematics Learning Guide | Decimal Measurement, Place Value and Rounding Accuracy
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Primary 4 Mathematics Learning Guide | Diagnostic Assessment, Capability Profile and Repair Routing
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Primary 4 Mathematics Learning Guide | Division, Remainders, Equal Grouping and Quotient Interpretation
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Primary 4 Mathematics Learning Guide | Equal Concept: Equal at First, Equal at End and Before–After Models
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Primary 4 Mathematics Learning Guide | Error Atlas, Misconceptions, First Weak Link and Correction
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Primary 4 Mathematics Learning Guide | Factors, Multiples, Common Factors and Common Multiples
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Primary 4 Mathematics Learning Guide | Fraction Addition, Subtraction, Common Denominators and Mixed Contexts
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Primary 4 Mathematics Learning Guide | Fraction Word Problems, Reference Wholes and Mixed Numbers
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Primary 4 Mathematics Learning Guide | Fractions, Decimals and Number Relationships
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Primary 4 Mathematics Learning Guide | Grouping Concept: Quantity × Value, Equal Sets and Regrouping
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Primary 4 Mathematics Learning Guide | Home Learning, Homework Independence and Parent Support
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Primary 4 Mathematics Learning Guide | Length: Kilometres, Metres, Centimetres and Compound Units
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Primary 4 Mathematics Learning Guide | Mass: Kilograms, Grams and Compound Units
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Primary 4 Mathematics Learning Guide | Mathematical Communication, Complete Working and Explanation
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Primary 4 Mathematics Learning Guide | Mixed Problem Laboratory, Interleaving and Transfer
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Primary 4 Mathematics Learning Guide | Mixed-Topic Problems, Representation Choice and Error Recovery
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Primary 4 Mathematics Learning Guide | Money in Decimal Notation, Change, Budgeting and Word Problems
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Primary 4 Mathematics Learning Guide | Multiple Solution Routes: Choosing, Comparing and Verifying Mathematics Strategies
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Primary 4 Mathematics Learning Guide | Multiplicative Comparison, Bar Models and Unknown Units
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Primary 4 Mathematics Learning Guide | Nets, 2D Representations and 3D Spatial Reasoning
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Primary 4 Mathematics Learning Guide | Number Sequences, Rounding, Estimation and Approximation
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Primary 4 Mathematics Learning Guide | Part-Whole, Difference and Equal-Group Models: Choosing the Correct Bar Model
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Primary 4 Mathematics Learning Guide | Patterns and Generalisation: Observe, Predict, Test and Explain
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Primary 4 Mathematics Learning Guide | Practice Paper: Arithmetic, Reasoning and Mixed Review with Worked Solutions
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Primary 4 Mathematics Learning Guide | Problem Posing, Changing Conditions and Creating Valid Questions
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Primary 4 Mathematics Learning Guide | Repeated Identity: Linked Comparisons, Shared Quantity and Model Drawing
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Primary 4 Mathematics Learning Guide | Revision Strategy: Topic Checklist, Weak-Link Repair and Assessment Readiness
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Primary 4 Mathematics Learning Guide | Shortage and Surplus: Excess, Deficit, Fixed Groups, Left Over and Short Of
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Primary 4 Mathematics Learning Guide | Simplifying Problems: Smaller Numbers, Simpler Cases and Rebuilding the Original
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Primary 4 Mathematics Learning Guide | Single Unchanged Quantity: Constant Single Subject and Before–After Reasoning
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Primary 4 Mathematics Learning Guide | Special Cases, Boundaries, Counterexamples and Impossible Cases
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Primary 4 Mathematics Learning Guide | Speed and Accuracy: Efficient Working, Pacing and Error Prevention
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Primary 4 Mathematics Learning Guide | Systematic Listing, Tables and Guess-and-Check
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Primary 4 Mathematics Learning Guide | Tables, Line Graphs, Pie Charts and Scale Reading
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Primary 4 Mathematics Learning Guide | Translating Representations: Words, Tables, Number Lines, Bar Models and Equations
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Primary 4 Mathematics Learning Guide | Unitary Method: One Unit, Fractional Part, Find the Whole and Scale Up
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Primary 4 Mathematics Learning Guide | Volume of Liquid: Litres, Millilitres and Compound Units
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Primary 4 Mathematics Learning Guide | Whole Numbers, Factors, Multiples and the Four Operations
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Primary 4 Mathematics Learning Guide | Working Backwards: Inverse Operations and Missing Quantities
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Primary 4 Mathematics Learning Hub | Number, Fractions, Geometry, Data and Problem Solving
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Primary 4 Mathematics Sengkang | The Voyage of Water
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Primary 4 Mathematics Sengkang | Upper-Primary Straddle Diagnostic
Browse every published Post
3746 results found
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How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0170 | Mathematics: Term Provenance — Know Where Every Symbol, Sign and Denominator Comes From
27–41 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0169 | English: Apposition and Renaming — Know When Two Noun Phrases Point to the Same Thing
22–33 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0168 | Requirement Traceability — Make Every Instruction Visible in the Final Answer
27–40 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0167 | Science: Calibration Curves — Use Known Standards to Measure an Unknown Without Inventing Precision
22–32 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0166 | Mathematics: Independent vs Redundant Constraints — Know When a New Condition Actually Narrows the Answer
25–37 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0165 | English: Substitution and Ellipsis Recovery — Reconstruct What the Sentence Leaves Unsaid
24–36 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0164 | Assumption Ledger — Separate What Is Given, Derived and Merely Assumed
23–35 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0163 | Science: Temporal Sampling Cadence — Measure Often Enough to See the Process Without Losing the Long-Term Pattern
26–39 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0162 | Mathematics: Parameter Recovery — Infer the Hidden Constant From the Data, Then Make It Prove Itself
24–37 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0161 | English: Definiteness and Reference — Track What A, The, This, That and Another Point To
23–34 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0160 | First Divergence — Find the Earliest Point Where Your Reasoning Stops Matching the Problem
21–32 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0159 | Science: Sampling Representativeness — Make Sure the Measurements Match the Population You Describe
27–40 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0158 | Mathematics: Benchmark Anchors — Use Simple Reference Values to Catch Implausible Answers
19–28 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0157 | English: Modifier-Scope Control — Know Exactly Which Part of the Sentence Each Modifier Changes
21–32 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0156 | Information Gain — Choose the Next Check That Removes the Most Uncertainty
21–31 minutes -
How to Perform in the new G3 SEC Examinations | Learner’s Guide Vol 0069 | EMS Source-to-Answer Translation Workshop — Passages, Tables, Graphs and Diagrams
18–27 minutes -
How to Perform in PSLE | Learner’s Guide Vol 0068 | When Two Methods Disagree, Find the First Point Where Their Meaning Diverges
26–39 minutes -
How to Perform in the new G3 SEC Examinations | Learner’s Guide Vol 0068 | Science: Controls, Confounders and Alternative Explanations Workshop
17–25 minutes -
How to Perform in PSLE | Learner’s Guide Vol 0067 | Science: Trace Light From Source to Object to Eye Before You Decide What Is Visible
22–33 minutes -
How to Perform in the new G3 SEC Examinations | Learner’s Guide Vol 0067 | Mathematics: Break-Even and Sensitivity Workshop — Thresholds, Models and Robust Decisions
17–25 minutes -
How to Perform in PSLE | Learner’s Guide Vol 0066 | Mathematics: Treat the Diagram as a Relationship Map, Not a Ruler
20–30 minutes -
How to Perform in the new G3 SEC Examinations | Learner’s Guide Vol 0066 | English: Claim Calibration Workshop — Certainty, Scope, Modality and Evidence
18–26 minutes -
How to Perform in PSLE | Learner’s Guide Vol 0065 | English: Separate Required Content From Helpful Detail in Situational Writing
24–35 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0155 | Science: Perturbation and Recovery — Disturb the System, Then Watch How It Returns or Fails to Return
25–38 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0154 | Mathematics: Transitivity Checks — Build and Test Chains of Greater Than, Equal To and Equivalent Relations
26–39 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0153 | English: Information-Status Control — Separate What Is Given, Asserted, Presupposed and Newly Introduced
25–37 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0152 | Counterfactual Swap Tests — Change One Decisive Condition and Predict What the Answer Must Do
27–40 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0151 | Science: Compartment Accounting — Track What Enters, Leaves, Accumulates and Moves Between Regions
27–41 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0150 | Mathematics: Reciprocal-Pair Checks — Use Inverse Rates and Conversions to Catch Direction Errors
23–35 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0149 | English: Semantic-Role Mapping — Track Who Acts, Who Is Affected and Who Experiences the Event
30–44 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0148 | Robustness Under Small Changes — Trust Answers That Survive Harmless Variations
28–41 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0147 | Science: Boundary Conditions — Know What Happens at the Edge of the System or Tested Range
30–45 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0146 | Mathematics: Residual Checks — Measure What Is Left Over After the Model Makes Its Prediction
28–42 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0145 | English: Sentence-Function Control — Identify What the Sentence Is Doing Before You Interpret Its Effect
30–44 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0144 | Falsification Checks — Try to Break the Answer Before You Trust It
31–47 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0143 | Science: Spatial Gradients — Track How a Quantity Changes From One Location to Another
33–50 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0142 | Mathematics: Decompose–Solve–Recombine — Break a Complex Problem Into Parts Without Losing the Whole
33–49 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0141 | English: Paragraph-Function Mapping — Know What Each Paragraph Is Doing in the Whole Text
33–49 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0140 | Proof Obligations — Know Exactly What Must Be Established Before the Answer Is Complete
35–53 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0139 | Science: Competing Timescales — Fast and Slow Processes Can Control Different Parts of the Result
34–52 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0138 | Mathematics: Symmetry Reasoning — Solve Repeated Structure Once and Use It Twice
30–45 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0137 | English: Lexical-Chain Cohesion — Track How a Text Keeps the Same Idea Alive Across Sentences
32–48 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0136 | Branch-and-Bound Elimination — Remove Impossible Paths Before You Fully Solve Them
33–50 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0135 | Science: Dose–Response Shape — Do Not Assume More Input Always Produces More Output
43–64 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0134 | Mathematics: Error Propagation — Know How Input Uncertainty Travels Into the Final Answer
38–57 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0133 | English: Entailment Control — Know What Must Follow and What Is Only Plausible
29–44 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0132 | Option Value — Preserve Useful Alternatives Until the Evidence Tells You to Commit
31–47 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0131 | Science: Bottleneck Reasoning — Find the Factor That Is Actually Limiting the System
43–65 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0130 | Mathematics: Normalisation to a Common Base — Compare Fairly When the Group Sizes Differ
36–54 minutes -
How to Perform in the new G2 SEC Examinations | Learner’s Guide Vol 0129 | English: Ambiguity Resolution — Test Competing Readings Against Grammar and Context
39–58 minutes
Routing rule: use this fallback only for discovery and orphan control. Canonical subject ownership, reader pathways and return logic continue to come from the Learning Castle, subject hubs and Complete Archives.
