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 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
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How to Choose a Useful Range and Spacing of Test Conditions in a PSLE Science Investigation
20–30 minutes -
How to Repair a PSLE Science Misconception by Replacing the Wrong Mechanism, Not Memorising an Exception
11–17 minutes -
How to Solve “Which Cannot Be Concluded?” PSLE Science Questions Without Reversing the Logic
11–17 minutes -
How to Read a PSLE Science Measurement That Hits the End of the Scale Without Treating the Limit as the True Value
12–19 minutes -
How to Read Top, Side and Cross-Section Views in PSLE Science as the Same Object
10–15 minutes -
How to Read the “Best” Tested Condition in PSLE Science Without Pretending It Is the True Optimum
15–22 minutes -
How to Improve Understanding | Meaning, Structure, Explanation and Transfer
17–25 minutes -
How to Diagnose a PSLE Science Mistake That Appears Only Under Time Pressure
13–20 minutes -
How to Compare Two PSLE Science Graphs With Different Scales Without Trusting Which Line Looks Steeper
11–17 minutes -
How to Improve a PSLE Science Investigation Without Changing the Scientific Question
13–19 minutes -
How to Improve Motivation | Value, Agency, Progress and the Return to Effort
17–26 minutes -
How to Read Unequal Time Intervals in PSLE Science Without Confusing Bigger Change With Faster Change
9–14 minutes -
How to Know When to Stop Practising a PSLE Science Concept and Move It to Delayed Review
11–16 minutes -
How to Choose the Decisive Evidence for a PSLE Science Answer Without Copying the Whole Table
10–14 minutes -
How to Define What Counts as an Observation in a PSLE Science Investigation
8–12 minutes -
How to Know When PSLE Science Does Not Give Enough Information to Decide
11–16 minutes -
How to Answer “Why Did This Not Happen?” in PSLE Science by Finding the Missing or Blocking Condition
14–21 minutes -
How to Spot When the Order of Testing Changes a PSLE Science Investigation
12–18 minutes -
How to Read a Rotated or Flipped PSLE Science Diagram Without Letting Orientation Change the Science
12–18 minutes -
How to Compare PSLE Science Counts When the Groups Are Different Sizes Without Letting the Bigger Group Win Automatically
11–17 minutes -
How to Read a Delayed Response in PSLE Science Without Assuming the Cause Started Late
12–18 minutes -
Top 10 Comparison Skills Worth Learning
18–27 minutes -
How Explanation Works in Teaching | Making Invisible Structure Visible Without Doing the Thinking for the Learner
20–30 minutes -
How to Improve Decision Making | Options, Evidence, Trade-Offs and Better Choices
16–24 minutes -
How to Decide Which PSLE Science Investigation Gives Stronger Evidence for a Claim
16–23 minutes -
How to Read a PSLE Science Graph Whose Axis Does Not Start at Zero Without Exaggerating the Difference
11–16 minutes -
How to Tell a Data Pattern From a Scientific Mechanism in PSLE Science
8–13 minutes -
How to Use a Scientific Model in PSLE Science Without Mistaking the Model for Reality
10–15 minutes -
How to Choose Measurement Intervals in a PSLE Science Investigation Without Missing the Pattern
11–16 minutes -
How to Read a PSLE Science Diagram as a Snapshot, a Sequence or a Process
10–15 minutes -
How to Use Confidence Ratings in PSLE Science Practice Without Mistaking Confidence for Understanding
17–26 minutes -
How Far Can a PSLE Science Conclusion Travel Beyond the Things That Were Actually Tested?
10–15 minutes -
How to Predict Beyond the Tested Range in PSLE Science Without Pretending the Trend Must Continue
8–13 minutes -
How to Interleave PSLE Science Revision Without Turning Mixed Practice Into Random Practice
16–23 minutes -
How to Tell “Happened Before” From “Caused” in PSLE Science
11–17 minutes -
How to Find the First Broken Link in a PSLE Science Explanation and Repair From There
14–21 minutes -
How to Decide Whether a PSLE Science Investigation Needs One Final Measurement or Repeated Measurements Over Time
15–22 minutes -
How to Spot When the Measuring Method Changes the PSLE Science Result
13–20 minutes -
Top 10 Pattern Recognition Skills Worth Learning
16–25 minutes -
How to Read a PSLE Science Diagram That Is Not Drawn to Scale Without Treating Size as Data
14–21 minutes -
How to Read PSLE Science When a Smaller Number Means a Bigger Effect
14–21 minutes -
How to Practise PSLE Science in Both Directions: Concept to Example and Example to Concept
15–23 minutes -
How to Decide Whether a PSLE Science Investigation Needs Repeated Trials or More Similar Specimens
16–23 minutes -
How to Read Qualitative PSLE Science Results Without Inventing Numbers
13–19 minutes -
How to Improve Critical Thinking | Claims, Evidence, Alternatives and Better Judgement
20–30 minutes -
Top 10 Sequencing Skills Worth Learning
22–32 minutes -
How to Read “No Evidence” in PSLE Science Without Concluding “No Effect”
9–13 minutes -
How to Identify an Unlabelled Part in a PSLE Science Diagram Without Guessing From Shape
12–18 minutes -
How to Choose the Right Comparison in PSLE Science: Before–After or Set-Up–to–Set-Up?
11–16 minutes -
How to Tell Function From Mechanism in PSLE Science So You Answer the Question Being Asked
11–16 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.
