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
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Primary 5 Science Tuition | Why Do Plants Wilt Without Water?
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Primary 5 Science Tuition | Why Do We Breathe Faster After Exercise?
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Primary 5 Science Tuition | Why Do Wet Clothes Dry Faster? Evaporation, Heat, Wind and Surface Area
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Primary 5 Science Tuition | Why Does a Bulb Light Only in a Complete Circuit?
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Primary 5 Science Tutor | Curie Series | Integrated Systems, Variables and Evidence
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Primary 5 Science | When Science Becomes a Systems Problem | Darwin × Voyage
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Primary 5 to Primary 6 Mathematics Bridge | Algebra & Unknowns from Number Sentences, Models & Inverse Thinking
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Primary 5 to Primary 6 Mathematics Bridge | Average from Totals, Equal Sharing & Data
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Primary 5 to Primary 6 Mathematics Bridge | Ratio from Fractions, Rate & Multiplicative Comparison
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Primary 5 to Primary 6 Mathematics Bridge | Speed from Rate, Time & Unit Conversion
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Primary 5 Tuition Sengkang | Building the PSLE Engine Before the Final Year
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Primary 5 → Primary 6 Mathematics Bridge | Percentage Difference, Percentage Change & Changing Reference Bases
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Primary 6 English Learning Guide | Articles, Determiners and Quantifiers: Reference, Quantity and Scope
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Primary 6 English Learning Guide | Cause, Contrast, Sequence and Comparison: Reading Logical Relationships
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Primary 6 English Learning Guide | Composition Sentence Craft, Cohesion and Paragraph Flow
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Primary 6 English Learning Guide | Comprehension Cloze: Cohesion, Context and Whole-Text Meaning
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Primary 6 English Learning Guide | Comprehension Question Types and Answer Precision
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Primary 6 English Learning Guide | Continuous Writing: Picture Stimulus Selection and Integration
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Primary 6 English Learning Guide | Continuous Writing: Topic, Plot and Revision
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Primary 6 English Learning Guide | Exam Error Analysis, Correction and Transfer
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Primary 6 English Learning Guide | Exam Simulation, Stamina, Time Control and Recovery
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Primary 6 English Learning Guide | Final PSLE Revision and the Secondary 1 Handover
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Primary 6 English Learning Guide | Grammar Cloze, Editing and Sentence Control
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Primary 6 English Learning Guide | Grammar for Meaning: Modality, Conditionals, Reported Speech and Passive Voice
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Primary 6 English Learning Guide | Independent Weekly Revision: Retrieval, Spacing, Transfer and Self-Checking
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Primary 6 English Learning Guide | Inference Across Paragraphs: Motive, Change and Evidence Boundaries
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Primary 6 English Learning Guide | Listening Comprehension: Preview, Evidence and Distractor Control
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Primary 6 English Learning Guide | Listening Comprehension: Selective Note-Taking, Numbers, Speakers and Change Signals
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Primary 6 English Learning Guide | Listening, Oral, Examination Control and the Secondary 1 Bridge
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Primary 6 English Learning Guide | Metacognition, Self-Checking and Independent Exam Control
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Primary 6 English Learning Guide | Non-Fiction Reading: Claims, Evidence, Fact, Opinion and Reliability
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Primary 6 English Learning Guide | Open-Ended Answer Editing: Precision, Completeness and Meaning
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Primary 6 English Learning Guide | Oral Communication: Reading Aloud and Stimulus-based Conversation
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Primary 6 English Learning Guide | Oral on Unfamiliar Topics: Reasoning Without Specialised Knowledge or Prepared Scripts
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Primary 6 English Learning Guide | Paper 2 Mixed-Skill Switching and Diagnostic Practice
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Primary 6 English Learning Guide | Phrasal Verbs, Idioms and Fixed Expressions: Meaning, Register and Natural Use
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Primary 6 English Learning Guide | Prepositions and Fixed Collocations: Time, Place, Movement and Natural Usage
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Primary 6 English Learning Guide | PSLE English Myths and False Rules: What the 2026 Examination Actually Requires
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Primary 6 English Learning Guide | Punctuation and Sentence Boundaries: Commas, Apostrophes and Dialogue
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Primary 6 English Learning Guide | Question Command Words and Answer Forms
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Primary 6 English Learning Guide | Reading Aloud: Phrasing, Stress, Pace, Pronunciation and Recovery
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Primary 6 English Learning Guide | Reading Under Time: Passage Navigation, Evidence and Recovery
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Primary 6 English Learning Guide | Reading, Comprehension, Inference and Evidence
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Primary 6 English Learning Guide | Reference, Pronouns and Cohesion: Tracking Meaning Across a Passage
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Primary 6 English Learning Guide | Situational Writing: Content Points and Tone
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Primary 6 English Learning Guide | Situational Writing: Source-Pack Selection, Transformation and Task Accuracy
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Primary 6 English Learning Guide | Spelling, Morphology and Word Formation in Editing
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Primary 6 English Learning Guide | Stimulus-Based Conversation: Opinion, Reason, Example, Follow-Up and Recovery
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Primary 6 English Learning Guide | Subject–Verb Agreement: Finding the True Subject
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Primary 6 English Learning Guide | Synthesis and Transformation: Meaning Preservation
Browse every published Post
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How to Use Blank-Page Retrieval to Find What You Cannot Yet Explain in PSLE Science
12–18 minutes -
How to Return to a Skipped PSLE Science Question Without Starting From Zero
10–15 minutes -
How to Use Scientific Keywords Without Keyword Dumping in PSLE Science
10–16 minutes -
How to Turn a Science Fact Into a Scientific Explanation in PSLE Science
11–16 minutes -
How to Evaluate Another Student’s Scientific Claim in PSLE Science
10–15 minutes -
How to Retest a Corrected PSLE Science Mistake After a Delay
10–15 minutes -
How to Distinguish Evidence of a Difference From Evidence of a Cause in PSLE Science
10–14 minutes -
How to Explain Why a Step Is Included in a PSLE Science Experiment
11–17 minutes -
How to Separate an Immediate Effect From a Later Consequence in PSLE Science
11–17 minutes -
How to Keep the Scientific Object Clear in a PSLE Science Answer
11–17 minutes -
How to Tell When a PSLE Science Answer Restates the Question Instead of Explaining It
12–18 minutes -
How to Compare Three or More PSLE Science Set-ups Without Losing the Fair Comparison
12–17 minutes -
How to Learn From a PSLE Science Model Answer Without Copying Its Wording
8–12 minutes -
How to Check a PSLE Science MCQ Against the Exact Condition in the Question
7–10 minutes -
How to Plan a PSLE Science Investigation From the Scientific Question
6–9 minutes -
How to Identify What Evidence a PSLE Science Question Actually Gives You
9–13 minutes -
How to Build a PSLE Science Question Family Around One Concept to Test Real Transfer
12–18 minutes -
How to Keep the Science Consistent Across a Multi-Part PSLE Science Question
10–15 minutes -
How to Stop Over-Answering PSLE Science Questions and Write Only the Science the Question Needs
9–14 minutes -
How to Draw a Scratch Science Model When a PSLE Question Feels Too Complicated
10–15 minutes -
How to Separate Necessary Conditions From Sufficient Evidence in PSLE Science
9–13 minutes -
How to Answer a PSLE Science Question When Several Conditions Change at Once
9–14 minutes -
How to Build a PSLE Science Mental Model That Survives Mixed Questions
10–15 minutes -
How to Learn From a PSLE Science Question You Got Right for the Wrong Reason
8–12 minutes -
How to Reason When Two PSLE Science Set-ups Give the Same Result
10–15 minutes -
How to Handle All, Some, Only, Always and Never in PSLE Science
10–15 minutes -
How to Choose Between Two Plausible Explanations in PSLE Science Using the Evidence
10–15 minutes -
How to Answer “Suggest a Reason” Questions in PSLE Science Without Turning Possibility Into Fact
11–17 minutes -
How to Learn Ion Chromatography and Suppressed Conductivity: From Ion Exchange and Eluent Chemistry to Suppression, Conductivity Peaks and Quantitative Limits
8–12 minutes -
How to Learn the Irving–Williams Series: From Ionic Size and Ligand-Field Stabilisation to the Cu(II) Maximum, Zn(II) Decline and Conditional Stability
7–11 minutes -
How to Learn Cyclohexane A-Values and 1,3-Diaxial Interactions: From Chair Conformations to Axial–Equatorial Equilibria, Steric Free Energy and Model Limits
7–11 minutes -
How to Learn the Butler–Volmer Equation and Tafel Kinetics: From Exchange Current and Overpotential to Charge-Transfer Coefficients, Polarisation Curves and Model Limits
9–13 minutes -
How to Track Direction and Change in PSLE Science
11–16 minutes -
How to Separate Rate From Amount in PSLE Science
10–16 minutes -
How to Work Backwards From an Outcome in PSLE Science
10–15 minutes -
How to Tell Observation, Inference, Prediction and Explanation Apart in PSLE Science
11–17 minutes -
How to Learn Anodic Stripping Voltammetry: From Electrochemical Preconcentration to Stripping Peaks, Trace-Metal Quantification and Measurement Limits
11–17 minutes -
How to Learn Metal–Metal Multiple Bonds and δ Bonding: From d-Orbital Overlap to Quadruple Bonds, Spectroscopic Evidence and Bond-Order Limits
12–17 minutes -
How to Learn More O’Ferrall–Jencks Diagrams: From Two Reaction Coordinates to Transition-State Motion, Concertedness and Mechanistic Limits
12–18 minutes -
How to Learn the Pitzer Equations: From Ionic Strength and Activity Coefficients to Concentrated Electrolytes, Brines and Model Limits
9–14 minutes -
How to Write a PSLE Science Conclusion That Says Only What the Evidence Supports
7–11 minutes -
How to Become Independent at PSLE Science Instead of Waiting for Hints
7–10 minutes -
How to Build a Weekly PSLE Science Learning Cycle: Learn → Retrieve → Apply → Correct → Return
8–12 minutes -
How to Learn PSLE Science From Primary 5 to the PSLE: A Complete Student Roadmap
8–13 minutes -
How to Learn Gran Plots for Titration: From pH and Electrode Response to Linearisation, Equivalence Volume and Analytical Uncertainty
8–12 minutes -
How to Learn Fajans’ Rules: From Ionic Polarisation to Covalent Character, Metal-Halide Trends and the Limits of a Qualitative Bonding Model
8–12 minutes -
How to Learn Norrish Type I and Type II Photochemistry: From Excited Carbonyls to Radical Cleavage, γ-Hydrogen Abstraction and Product Branching
7–11 minutes -
How to Learn the Gouy–Chapman–Stern Electric Double Layer: From Surface Charge and Diffuse Ions to Potential Profiles, Capacitance and Model Limits
8–11 minutes -
How to Learn Job’s Method of Continuous Variations: From Mole Fractions and Stoichiometric Maxima to Complex Equilibria, Ambiguity and Reliable Chemical Inference
7–11 minutes -
How to Learn Berry Pseudorotation: From Trigonal-Bipyramidal Axial–Equatorial Exchange to Fluxional NMR, Phosphorane Stereochemistry and Model Limits
8–11 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.
