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 6 English Learning Guide | Tense and Aspect: Time, Sequence and Meaning
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Primary 6 English Learning Guide | Text Structure, Main Idea and Paragraph Function
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Primary 6 English Learning Guide | Verb Patterns: Gerunds, Infinitives and Complement Control
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Primary 6 English Learning Guide | Viewpoint, Character Voice and Perspective in Reading
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Primary 6 English Learning Guide | Visual Text: Purpose, Audience, Layout and Evidence
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Primary 6 English Learning Guide | Visual Text: Small Print, Conditions, Numbers and Persuasion
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Primary 6 English Learning Guide | Vocabulary in Context, Collocation and Vocabulary Cloze
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Primary 6 English Learning Guide | Vocabulary in Context, Language Effect and Tone
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Primary 6 English Learning Guide | Vocabulary, Grammar, Synthesis, Cloze and Editing
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Primary 6 English Learning Guide | Writing for Purpose, Audience, Situational Writing and Continuous Writing
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Primary 6 English Sengkang | The Voyage of Water
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Primary 6 English Sengkang | Why 3-Pax Helps Examination Recovery
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Primary 6 English Tuition Centre Sengkang | Use Every Paper as Telemetry
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Primary 6 English Tuition Sengkang | PSLE English Preparation & Exam Control
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Primary 6 English Tutor | Curie Series | Integration, PSLE and the Handover to Secondary English
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Primary 6 English | When Language Becomes Examination Performance | Darwin × Voyage
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Primary 6 Mathematics Learning Guide | Age Problems and Constant-Difference Reasoning Across Time
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Primary 6 Mathematics Learning Guide | Algebra, Unknowns, Expressions and Simple Equations
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Primary 6 Mathematics Learning Guide | Angles in Geometric Figures and Shape Properties
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Primary 6 Mathematics Learning Guide | Applications, Assumptions and Model Limits
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Primary 6 Mathematics Learning Guide | Assumption Method, Replacement Difference and All-One-Type Reasoning
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Primary 6 Mathematics Learning Guide | Average and Data Relationships
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Primary 6 Mathematics Learning Guide | Case Splitting and Decision Trees
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Primary 6 Mathematics Learning Guide | Circles, Composite Figures and Volume
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Primary 6 Mathematics Learning Guide | Conditional Ratio Problems: If-Then Changes, Ratio Constraints and Scenario Reconstruction
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Primary 6 Mathematics Learning Guide | Connecting Concepts Across Topics
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Primary 6 Mathematics Learning Guide | Constant Part Problems and Changing Ratios
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Primary 6 Mathematics Learning Guide | Constant Total Problems and Internal Transfer
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Primary 6 Mathematics Learning Guide | Constraints, Bounds and Feasibility
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Primary 6 Mathematics Learning Guide | Container and Content Problems: Fixed Base Area, Water-Level Change and Volume Conservation
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Primary 6 Mathematics Learning Guide | Data Displays, Graphs and Statistical Interpretation
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Primary 6 Mathematics Learning Guide | Deductive Reasoning and Logical Chains
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Primary 6 Mathematics Learning Guide | Double-IF Problems and Two-Scenario Reasoning
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Primary 6 Mathematics Learning Guide | Drawing Diagrams and Representation Switching
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Primary 6 Mathematics Learning Guide | Elimination Method: Cancelling Equal Quantities Across Paired Conditions
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Primary 6 Mathematics Learning Guide | Equal Fractions and Common-Numerator Reasoning
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Primary 6 Mathematics Learning Guide | Equal Stage Problems and End-State Reconstruction
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Primary 6 Mathematics Learning Guide | Everything Changed Problems and Units-and-Parts Reasoning
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Primary 6 Mathematics Learning Guide | Excess-and-Shortage Problems and Fixed-Total Grouping
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Primary 6 Mathematics Learning Guide | Folded Shapes, Creases and Hidden-Angle Visualisation
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Primary 6 Mathematics Learning Guide | Fractions, Decimals, Percentages and Ratio as Equivalent Representations
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Primary 6 Mathematics Learning Guide | Fractions, Division and Part-Whole Reasoning
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Primary 6 Mathematics Learning Guide | Gap-and-Difference Problems and Comparison Change
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Primary 6 Mathematics Learning Guide | Grouping, Number × Value and Equal-Group Reconstruction
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Primary 6 Mathematics Learning Guide | Guess, Check, Improve and Assumption Testing
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Primary 6 Mathematics Learning Guide | Information Sufficiency and Missing Data
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Primary 6 Mathematics Learning Guide | Mathematical Communication, Working and Justification
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Primary 6 Mathematics Learning Guide | Mathematical Modelling: From Real Situation to Model and Back
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Primary 6 Mathematics Learning Guide | Measurement Units, Conversion and Dimensional Reasoning
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Primary 6 Mathematics Learning Guide | Metacognition, Self-Monitoring and Strategy Control
Browse every published Post
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How to Check That Two PSLE Science Numbers Measure the Same Scientific Quantity Before Comparing Them
8–12 minutes -
How to Tell a Scientific Property From a Current State in PSLE Science
8–12 minutes -
How to Tell When a PSLE Science Investigation Has No Valid Comparison Yet
8–12 minutes -
How to Use Everyday Experience in PSLE Science Without Letting Intuition Override the Evidence
8–12 minutes -
How to Tell Whether an Apparatus in a PSLE Science Set-Up Is Changing the System or Only Measuring It
10–16 minutes -
How to Use AI for PSLE Science Practice Without Letting It Replace Your Scientific Reasoning
11–17 minutes -
How to Stop a PSLE Science Classification When the Evidence Runs Out Without Guessing a Missing Characteristic
9–13 minutes -
How to Tell Whether a PSLE Science Set-Up Demonstrates a Phenomenon or Tests What Causes It
10–15 minutes -
How to Use Scratch Working in PSLE Science Without Turning It Into Another Answer
8–13 minutes -
How to Tell Continuous From Repeated Conditions in a PSLE Science Investigation Even When Total Time Is the Same
8–11 minutes -
How to Decide When PSLE Science Repeated Results Should Be Averaged — and When They Should Stay Separate
8–12 minutes -
How to Decide Whether to Repeat One PSLE Science Trial, Repeat the Whole Investigation or Redesign the Method
10–14 minutes -
How to Tell Whether a PSLE Science Difference Existed Before the Test or Appeared During It
9–14 minutes -
How to Tell a New PSLE Science Event From the Same Continuing State Observed Again
8–13 minutes -
How to Compare PSLE Science Set-Ups at the Same Clock Time Without Confusing Elapsed Duration
9–13 minutes -
How to Read “Both”, “Either” and “Neither” in PSLE Science Without Mixing the Logic
8–13 minutes -
How to Read “Initially”, “Immediately”, “After Some Time” and “Eventually” in PSLE Science Without Mixing the States
9–13 minutes -
How to Diagnose a PSLE Science Explanation That Uses the Right Concept but Links It to the Wrong Evidence
9–13 minutes -
How to Tell Whether a PSLE Science Effect Can Continue After a Condition Is Removed Without Assuming the Cause Is Still Acting
9–13 minutes -
How to Tell Whether Repeating a PSLE Science Investigation Improves Repeatability Without Making an Unfair Test Fair
10–14 minutes -
How to Tell Whether Two PSLE Science Diagrams Show a Different View or a Later Stage
11–16 minutes -
How to Use All Relevant PSLE Science Repeat Results Without Cherry-Picking the Convenient Ones
10–14 minutes -
How to Compare PSLE Science Results When Different Set-Ups Have Different Numbers of Repeats
10–15 minutes -
How to Read a PSLE Science Flow Diagram When Different Paths Merge Into the Same Outcome
10–15 minutes -
How to Write a PSLE Science Method Another Student Could Follow Without Guessing the Missing Steps
12–17 minutes -
How to Decide When a PSLE Science Reading Is Stable Enough to Record
9–14 minutes -
How to Tell Treatment Duration From Measurement Interval in a PSLE Science Investigation
9–13 minutes -
How to Reset a PSLE Science Investigation Between Trials Without Changing the Question
12–19 minutes -
How to Learn From Wrong PSLE Science MCQ Options Without Memorising the Distractors
9–13 minutes -
How to Reason When a PSLE Science Outcome Needs Two Conditions at the Same Time
8–12 minutes -
How to Rank PSLE Science Set-Ups From Pairwise Evidence Without Inventing a Complete Order
8–12 minutes -
How to Read “If”, “Only If” and “Unless” in PSLE Science Without Reversing the Condition
9–13 minutes -
How to Tell Per-Object Values From Total Values in PSLE Science
11–16 minutes -
How to Tell Whether a PSLE Science Result Belongs to One Component or the Whole Set-Up
10–15 minutes -
How to Avoid Counting the Same PSLE Science Evidence Twice When It Appears in More Than One Representation
10–15 minutes -
How to Track a PSLE Science Sample After It Is Split Into Two Test Portions
10–15 minutes -
How to Read a PSLE Science Result After Two Samples Have Been Combined
9–14 minutes -
How to Track a PSLE Science Specimen When It Moves From One Set-Up to Another
9–13 minutes -
How to Choose the Next PSLE Science Measurement When the Evidence Cannot Yet Decide
9–13 minutes -
How to Tell Which PSLE Science Conditions Are Given and Which You Are Inferring
10–14 minutes -
How to Know Whether a PSLE Science Question Actually Needs a Calculation
8–12 minutes -
How to Practise PSLE Science MCQ by Predicting Before You Look at the Answer Options
7–11 minutes -
How to Sort PSLE Science Given Information Into Evidence, Conditions, Context and Unused Detail
8–12 minutes -
How to Tell a Hypothetical PSLE Science Change From an Actual Observation or Result
8–12 minutes -
How to Handle an Anomalous PSLE Science Result Without Deleting It Just Because It Looks Wrong
15–22 minutes -
How to Read “Repeat Until” in a PSLE Science Method Without Counting Every Loop as a New Trial
10–15 minutes -
How to Read NOT, EXCEPT and LEAST in PSLE Science Without Answering the Opposite Question
9–14 minutes -
How to Avoid Stacking PSLE Science Inferences on Top of Each Other Without Enough Evidence
10–15 minutes -
How to Update a PSLE Science Explanation When New Evidence Is Added
15–22 minutes -
How to Tell Whether a PSLE Science Mistake Comes From the Science or From Misreading a Scientific Term
13–19 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.
