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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Secondary 3 Mathematics Punggol | Build the Upper-Secondary Math Engine
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Secondary 3 Mathematics Sengkang | The Voyage of Water
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Secondary 3 Mathematics Tuition Sengkang | Upper Secondary Math, Transfer & SEC Readiness
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Secondary 3 Mathematics Tutor | Curie Series | Algebra, Functions and Examination-Ready Strategy Control
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Secondary 3 Mathematics | Why the Load Compounds Here | Darwin × Voyage
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Secondary 3 Science Tutor | Curie Series | Biology, Chemistry, Physics and Experimental Control
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Secondary 3 Tuition Sengkang | Upper-Secondary Specialisation & SEC Readiness
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Secondary 3–4 Additional Mathematics Punggol | From Entry to Examination
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Secondary 4 Additional Mathematics Learning Guide | Advanced Differentiation, Rates of Change and Second-Derivative Control
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Secondary 4 Additional Mathematics Learning Guide | Advanced Integration of Trigonometric and Exponential Functions and Signed Areas
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Secondary 4 Additional Mathematics Learning Guide | Algebra Under Pressure, Exact Forms and Manipulation Control
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Secondary 4 Additional Mathematics Learning Guide | Binomial Theorem and Coefficient Reasoning
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Secondary 4 Additional Mathematics Learning Guide | Calculator Discipline, Estimation and Exactness
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Secondary 4 Additional Mathematics Learning Guide | Case Analysis, Branching and Exhaustive Solution Sets
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Secondary 4 Additional Mathematics Learning Guide | Confidence Calibration, Error Prediction and Verification Budgeting
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Secondary 4 Additional Mathematics Learning Guide | Controlled Variation, Near-Miss Questions and Method Discrimination
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Secondary 4 Additional Mathematics Learning Guide | Coordinate Geometry, Circles and Linearisation
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Secondary 4 Additional Mathematics Learning Guide | Differentiation, Tangents, Normals and Stationary Points
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Secondary 4 Additional Mathematics Learning Guide | Domains, Constraints and Solution Filtering
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Secondary 4 Additional Mathematics Learning Guide | Error Maps, Paper Repair and Diagnostic Classification
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Secondary 4 Additional Mathematics Learning Guide | Essential Working, Evidence Preservation and Recoverable Marks
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Secondary 4 Additional Mathematics Learning Guide | Exponential and Logarithmic Functions and Equations
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Secondary 4 Additional Mathematics Learning Guide | Formula Sheet Intelligence, Memory Allocation and Retrieval Control
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Secondary 4 Additional Mathematics Learning Guide | Formula Sheet Intelligence, Memory Allocation and Retrieval Control
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Secondary 4 Additional Mathematics Learning Guide | Functions, Transformations and Inverse Structure
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Secondary 4 Additional Mathematics Learning Guide | Graph Sketching, Asymptotes and Turning-Point Interpretation
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Secondary 4 Additional Mathematics Learning Guide | Hidden Assumed Knowledge, Prerequisites and Fast Repair
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Secondary 4 Additional Mathematics Learning Guide | Integration, Definite Integrals and Area Under Curves
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Secondary 4 Additional Mathematics Learning Guide | Kinematics: Displacement, Velocity and Acceleration
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Secondary 4 Additional Mathematics Learning Guide | Linear Law, Transformations and Parameter Recovery
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Secondary 4 Additional Mathematics Learning Guide | Mastery Checkpoint, Full-Syllabus Diagnostic and Final-Year Readiness
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Secondary 4 Additional Mathematics Learning Guide | Mathematical Communication, Notation and Complete Reasoning
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Secondary 4 Additional Mathematics Learning Guide | Mathematical Modelling and Parameter Problems
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Secondary 4 Additional Mathematics Learning Guide | Method Economy, Shortest Safe Routes and Mark Efficiency
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Secondary 4 Additional Mathematics Learning Guide | Mixed-Topic Route Selection, Transfer and Integration
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Secondary 4 Additional Mathematics Learning Guide | Multi-Constraint Problems, Feasible Sets and Condition Stacking
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Secondary 4 Additional Mathematics Learning Guide | Multi-Stage Question Architecture, Subgoals and Dependency Chains
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Secondary 4 Additional Mathematics Learning Guide | Necessary and Sufficient Conditions, Converses and Logical Structure
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Secondary 4 Additional Mathematics Learning Guide | Non-Routine Problem Solving and Alternative Methods
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Secondary 4 Additional Mathematics Learning Guide | Past-Paper Forensics, Question Archetypes and Pattern Mining
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Secondary 4 Additional Mathematics Learning Guide | Past-Paper Forensics, Question Archetypes and Pattern Mining
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Secondary 4 Additional Mathematics Learning Guide | Plane Geometry Proofs and Circle Theorems
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Secondary 4 Additional Mathematics Learning Guide | Polynomials, Factor and Remainder Theorems and Partial Fractions
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Secondary 4 Additional Mathematics Learning Guide | Quadratic Functions and Discriminant Control
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Secondary 4 Additional Mathematics Learning Guide | Schema Extraction, Solution Compression and Reusable Mathematical Templates
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Secondary 4 Additional Mathematics Learning Guide | Surds, Rationalisation and Exact Algebra
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Secondary 4 Additional Mathematics Learning Guide | Topical-to-Full-Paper Progression, Prelim Calibration and Examination Transfer
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Secondary 4 Additional Mathematics Learning Guide | Topical-to-Full-Paper Progression, Prelim Calibration and Examination Transfer
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Secondary 4 Additional Mathematics Learning Guide | Topical-to-Full-Paper Progression, Prelim Calibration and Examination Transfer
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Secondary 4 Additional Mathematics Learning Guide | Trigonometric Functions, Identities and Equations
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.
