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 Learning Guide | Mastery Diagnostic & Repair Lab
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Primary 5 Science Learning Guide | Measurement, Units, Range & Resolution
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Primary 5 Science Learning Guide | Mixed-Concept Transfer Challenge Lab
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Primary 5 Science Learning Guide | Models, Assumptions, Simplification & Limits
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Primary 5 Science Learning Guide | Observation, Inference, Prediction & Conclusion
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Primary 5 Science Learning Guide | Open-Ended Answer Construction Application Lab
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Primary 5 Science Learning Guide | Plant & Human Reproduction Comparison, Sequence & Evidence
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Primary 5 Science Learning Guide | Plant & Human Systems Application Lab
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Primary 5 Science Learning Guide | Plant Transport, Respiratory & Circulatory Systems
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Primary 5 Science Learning Guide | Pollination, Fertilisation, Seeds & Fruits
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Primary 5 Science Learning Guide | Practical Planning, Data Recording & Conclusions
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Primary 5 Science Learning Guide | Primary 5 to Primary 6 Bridge, Consolidation & the PSLE Runway
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Primary 5 Science Learning Guide | Question Deconstruction, Conditions & Constraints
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Primary 5 Science Learning Guide | Rates, Time, Change & Comparative Reasoning
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Primary 5 Science Learning Guide | Reliability, Accuracy, Validity & Data Quality
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Primary 5 Science Learning Guide | Reproduction Application Lab
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Primary 5 Science Learning Guide | Reproduction in Plants and Humans
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Primary 5 Science Learning Guide | Retrieval, Spaced Review & Concept Transfer
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Primary 5 Science Learning Guide | Scaling, Ratios, Proportional Thinking & Estimation
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Primary 5 Science Learning Guide | Scientific Communication & Evidence Chains
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Primary 5 Science Learning Guide | Scientific Vocabulary & Precision Challenge Lab
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Primary 5 Science Learning Guide | Self-Checking & Exam Readiness Challenge Lab
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Primary 5 Science Learning Guide | Sequence, Cycles, Dependencies & Order of Events
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Primary 5 Science Learning Guide | Structure, Function, Systems & Cause-and-Effect
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Primary 5 Science Learning Guide | Variables, Fair Tests & Experimental Design
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Primary 5 Science Learning Guide | Water & Food Transport in Plants
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Primary 5 Science Learning Guide | Water & State Change Application Lab
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Primary 5 Science Learning Guide | Water, Changes of State, the Water Cycle & Evidence
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Primary 5 Science Learning Guide | What-If Changes & System Failure Reasoning
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Primary 5 Science Learning Hub | Water, Reproduction, Systems & Electricity
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Primary 5 Science Punggol | Legacy Entry to Systems & Variables
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Primary 5 Science Punggol | Systems, Variables & the PSLE Runway
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Primary 5 Science Sengkang | Systems & Variables Diagnostic
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Primary 5 Science Sengkang | The Voyage of Water
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Primary 5 Science Tuition Punggol | Systems, Variables and Interactions | The Voyage Series
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Primary 5 Science Tuition Sengkang | Systems, Variables & PSLE Foundations
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Primary 5 Science Tuition | Answering Techniques for Open-Ended Questions
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Primary 5 Science Tuition | Conductors and Insulators in Electrical Circuits
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Primary 5 Science Tuition | For Beginners: The Year Science Becomes Serious
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Primary 5 Science Tuition | How Are Seeds Dispersed? Wind, Water, Animals and Explosive Action
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Primary 5 Science Tuition | How Do Water and Food Move Through Plants?
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Primary 5 Science Tuition | How Does Blood Transport Oxygen and Carbon Dioxide?
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Primary 5 Science Tuition | Pollination, Fertilisation, Seeds and Fruits
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Primary 5 Science Tuition | The PSLE Science Engine Year
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Primary 5 Science Tuition | The Revision System for the Year Before PSLE
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Primary 5 Science Tuition | What Do Seeds Need to Germinate? Water, Air and Suitable Warmth
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Primary 5 Science Tuition | What Happens When One Bulb Is Removed? Series and Parallel Circuits
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Primary 5 Science Tuition | Where Will Water Droplets Form?
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Primary 5 Science Tuition | Which Switch Controls Which Bulb?
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Primary 5 Science Tuition | Why Do Bulbs Get Dimmer? Circuit Changes and Brightness
Browse every published Post
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The Tutor Handbook Vol No.0007 | Learning Architect — Integrate the Whole Learning System Without Making the Learner Dependent on the Tutor
35–53 minutes -
The Tutor Handbook Vol No.0006 | Performance Coach — Convert Available Knowledge Into Reliable Output Under Pressure
35–52 minutes -
The Tutor Handbook Vol No.0005 | Route Designer — Sequence Learning So Effort Arrives in the Right Order
35–52 minutes -
The Tutor Handbook Vol No.0004 | Diagnostic Tutor — Find the First Weak Link Before Adding More Work
24–37 minutes -
The Tutor Handbook Vol No.0003 | Drill Builder — Build Fluency Without Mindless Repetition
24–36 minutes -
The Tutor Handbook Vol No.0002 | Explainer — Make Difficult Ideas Clear Without Replacing the Student’s Thinking
38–57 minutes -
The Tutor Handbook Vol No.0001 | Homework Helper — From Task Completion to Better Learning Routines
33–49 minutes -
How to Track PSLE Science Learning Progress Without Letting One Practice-Paper Score Decide What You Know
9–14 minutes -
How to Paraphrase a PSLE Science Question Without Changing What the Science Says
13–19 minutes -
How to Make a Scientific Estimate in PSLE Science Without Pretending It Is a Measurement
11–16 minutes -
How to Tell Classification From Ranking in PSLE Science
9–13 minutes -
How to Use Scientific Constraints to Rule Out Impossible PSLE Science Answers
11–17 minutes -
How to Increase PSLE Science Practice Difficulty by Changing One Reasoning Demand at a Time
10–16 minutes -
How to Defend a PSLE Science Explanation With Evidence and Still Be Ready to Revise It
12–18 minutes -
How to Compare Two Scientific Models in PSLE Science and Decide Which One Is More Useful
10–16 minutes -
How to Design an Indirect Measurement in PSLE Science When the Target Cannot Be Measured Directly
11–17 minutes -
How to Track the Same Scientific Quantity When Its Role Changes Between Stages of a PSLE Science Question
8–11 minutes -
How to Tell “Explain How” From “Explain Why” in PSLE Science Without Memorising Two Answer Templates
7–11 minutes -
How to Ask What Would Have to Change for a Wrong PSLE Science Answer to Become Correct
7–11 minutes -
How to Turn a PSLE Science Explanation Into a New Question That Tests the Same Mechanism
8–12 minutes -
How to Practise for the Revised 2026 PSLE Science Structured Questions Without Memorising New Answer Templates
10–16 minutes -
How to Tell an Investigation Constraint From a Scientific Variable in PSLE Science
9–14 minutes -
How to Practise PSLE Science Without Topic Labels So You Learn to Choose the Concept Yourself
10–14 minutes -
How to Use a PSLE Science Pre-Question Before Studying Without Turning It Into Guessing
9–14 minutes -
How to Tell Whether a PSLE Science Question Can Actually Be Answered by an Investigation
9–13 minutes -
How to Infer a Missing PSLE Science Graph Axis Label From the Investigation Evidence
8–12 minutes -
How to Tell Whether a Number in a PSLE Science Diagram Is a Label, a Measurement or a Sequence Marker
8–11 minutes -
How to Choose the Right Reference Set-Up for a PSLE Science Comparison
8–12 minutes -
How to Choose Which Variable to Change When Several Factors Could Affect a PSLE Science Outcome
8–12 minutes -
How to Divide Similar Specimens Between PSLE Science Set-Ups Without Building In a Starting Bias
7–10 minutes -
How to Tell a Temporary PSLE Science Response From a Sustained Change
7–11 minutes -
How to Read an Analogue PSLE Science Scale Without Parallax Error
7–11 minutes -
How to Use an Intermediate PSLE Science Measurement to Locate Where a Process Changed
10–16 minutes -
How to Tell Whether Two Scientific Factors Form a Chain or Act Separately in a PSLE Science Explanation
11–16 minutes -
How to Tell Whether Two PSLE Science Data Sets Measured the Same Outcome in Comparable Ways
12–17 minutes -
How to Break a Two-Option Tie in PSLE Science MCQ Without Guessing
11–17 minutes -
How to Keep a PSLE Science Claim at the Right Evidence Level: One Reading, One Trial, One Set-Up or the Whole Investigation
12–17 minutes -
How to Tell Stronger Evidence From a Bigger Scientific Effect in PSLE Science
8–11 minutes -
How to Check Whether a PSLE Science Method Improvement Creates a New Flaw
8–12 minutes -
How to Tell Whether a Later PSLE Science Diagram Replaces the Earlier Set-Up or Continues It
8–12 minutes -
How to Tell Whether a PSLE Science Investigation Is Comparing Two Cases or Testing a Relationship Across Several Conditions
8–11 minutes -
How to Tell a Scientific Example From Evidence in a PSLE Science Answer
12–18 minutes -
How to Test Whether a PSLE Science Correction Transfers to a New Representation
11–16 minutes -
How to Make a PSLE Science Prediction at the Right Precision Without Guessing an Exact Number
9–14 minutes -
How to Decide Whether Two PSLE Science Measurements Are Different Enough for the Scale to Support a Real Difference
9–14 minutes -
How to Decide Whether a PSLE Science Investigation Should Measure the Whole System or a Sample
8–12 minutes -
How to Decide Whether to Measure a PSLE Science Change Directly or Calculate It From Before-and-After Measurements
7–11 minutes -
How to Check Whether a PSLE Science Explanation Accounts for All the Important Observations
7–11 minutes -
How to Spot a Circular PSLE Science Explanation That Uses the Outcome as Its Own Cause
8–12 minutes -
How to Tell Natural Specimen Variation From Measurement Variation in PSLE Science Results
6–9 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.
