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 1 Mathematics Classroom | Chapter 4: Percentages and Reverse Percentages | G2/G3
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Secondary 1 Mathematics Classroom | Chapter 5: Rate, Speed and Unit Conversion | G2/G3
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Secondary 1 Mathematics Classroom | Chapter 6: Algebraic Language, Expressions, Formulae and nth-Term Patterns | G2/G3
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Secondary 1 Mathematics Classroom | Chapter 7: Linear Equations and Problem Formation | G2/G3
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Secondary 1 Mathematics Classroom | Chapter 8: Coordinates, Linear Functions, Graphs and Gradient | G2/G3
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Secondary 1 Mathematics Classroom | Chapter 9: Angles, Triangles, Polygons and Geometrical Construction | G2/G3
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Secondary 1 Mathematics Learning Guide | Algebraic Expressions and Variables
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Secondary 1 Mathematics Learning Guide | Algebraic Formulae, Substitution and Rearrangement
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Secondary 1 Mathematics Learning Guide | Algebraic Simplification, Like Terms, Brackets and Common Factors
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Secondary 1 Mathematics Learning Guide | Average Rate, Average Speed and Multi-Stage Journeys
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Secondary 1 Mathematics Learning Guide | Calculator Skills, Exact Values and Input Discipline
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Secondary 1 Mathematics Learning Guide | Congruence, Similarity and Scale-Factor Reasoning
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Secondary 1 Mathematics Learning Guide | Conjectures, Counterexamples, Proof and Mathematical Conviction
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Secondary 1 Mathematics Learning Guide | Coordinates, Linear Graphs and Relationships
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Secondary 1 Mathematics Learning Guide | Data Collection, Sampling, Bias and Statistical Representation
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Secondary 1 Mathematics Learning Guide | Data, Averages, Statistical Representations and Probability
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Secondary 1 Mathematics Learning Guide | Directed Numbers, Rational Numbers and Four Operations
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Secondary 1 Mathematics Learning Guide | Equations and Equality
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Secondary 1 Mathematics Learning Guide | Geometrical Construction, Scale Drawings and Loci
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Secondary 1 Mathematics Learning Guide | Geometry, Angles and Polygons
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Secondary 1 Mathematics Learning Guide | Indices, Powers and Standard Form
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Secondary 1 Mathematics Learning Guide | Linear Inequalities and Number-Line Reasoning
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Secondary 1 Mathematics Learning Guide | Mathematical Communication, Working and Justification
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Secondary 1 Mathematics Learning Guide | Mensuration, Perimeter, Area, Surface Area and Volume
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Secondary 1 Mathematics Learning Guide | Mixed-Topic Strategy, Verification and Error Analysis
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Secondary 1 Mathematics Learning Guide | Number Patterns, Sequences and nth-Term Generalisation
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Secondary 1 Mathematics Learning Guide | Numbers, Number Lines, Approximation and Estimation
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Secondary 1 Mathematics Learning Guide | Percentage Points, Percentage Change and Comparison
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Secondary 1 Mathematics Learning Guide | Percentages and Reverse Percentages
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Secondary 1 Mathematics Learning Guide | Prime Factorisation, HCF, LCM, Squares, Cubes and Roots
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Secondary 1 Mathematics Learning Guide | Pythagoras’ Theorem and Right-Triangle Reasoning
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Secondary 1 Mathematics Learning Guide | Rate, Speed and Unit Conversion
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Secondary 1 Mathematics Learning Guide | Ratio and Proportion
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Secondary 1 Mathematics Learning Guide | Read the Question Before Choosing a Method
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Secondary 1 Mathematics Learning Guide | Real Numbers, Irrational Numbers and Number Classification
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Secondary 1 Mathematics Learning Guide | Set Language, Venn Diagrams and Counting
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Secondary 1 Mathematics Learning Guide | Symmetry, Reflections, Rotations and Invariant Properties
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Secondary 1 Mathematics Learning Guide | Word Problems and Mathematical Representation
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Secondary 1 Mathematics Punggol | Legacy Entry to the S1 Mathematics System
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Secondary 1 Mathematics Sengkang | The Voyage of Water
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Secondary 1 Mathematics Tuition
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Secondary 1 Mathematics Tuition Sengkang | The Primary-to-Secondary Math Reset
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Secondary 1 Mathematics Tutor | Curie Series | Reorganising Arithmetic Into Algebraic Structure
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Secondary 1 Mathematics Walkthrough | Chapter-by-Chapter Classroom Route | G2/G3
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Secondary 1 Science Tutor | Curie Series | From Primary Themes to Models, Measurement and Disciplines
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Secondary 1 Tuition Sengkang | The Primary-to-Secondary Learning Reset
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Secondary 2 English Learning Guide | Cohesion Across Sentences and Paragraphs
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Secondary 2 English Learning Guide | Comparative Reading: Viewpoint, Agreement, Difference and Evaluation
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Secondary 2 English Learning Guide | Comprehension Cloze: Context, Cohesion, Vocabulary and Logic
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Secondary 2 English Learning Guide | Comprehension Question Control and Answer Precision
Browse every published Post
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Bolt Measurement Note — Open-Book and Closed-Book Scores Do Not Mean the Same Thing by Default
6–9 minutes -
MindOS Learning Manual: Retrieval-Induced Forgetting State | Retrieving One Answer Can Make a Related Answer Harder to Access
6–10 minutes -
MindOS Learning Manual: Judgment-of-Learning State | Feeling Learned Is Not the Same as Predicting What You Will Remember
7–11 minutes -
Bolt Performance Calibration — This Year’s School Average May Change Because This Year’s Students Changed
6–10 minutes -
Bolt Measurement Note 28 — Paper and Screen Scores Are Not Automatically Interchangeable
6–8 minutes -
Bolt Performance Calibration — A Teacher Prediction Can Change the Performance It Later Appears to Predict
6–9 minutes -
Bolt Measurement Note 27 — You Cannot Judge an Intervention Before You Know What Was Actually Implemented
6–8 minutes -
MindOS Learning Manual: Paraphrase State | “In Your Own Words” Can Still Be Wrong
8–11 minutes -
Bolt Performance Calibration — A Low-Stakes Score Can Measure Effort as Well as Achievement
6–8 minutes -
Bolt Measurement Note 26 — A Coaching Conversation Is Not Yet Improved Teaching
6–9 minutes -
Bolt Performance Calibration — A Higher Score With an Accommodation Does Not Automatically Mean an Unfair Advantage
6–9 minutes -
MindOS Learning Manual: Learning-by-Teaching State | Preparing to Teach Can Change How You Learn
7–11 minutes -
Bolt Measurement Note 25 — A Class Score Gain Is Not Automatically the Teacher’s Effect
7–10 minutes -
MindOS Learning Manual: Gesture-to-Learn State | Sometimes the Hands Can Carry Part of the Idea
6–10 minutes -
Student/Studying Interface Learning Manual: Diagram & Figure Interface | A Picture Can Contain the Answer and Still Be Hard to Read
4–6 minutes -
MindOS Learning Manual: Production-Effect State | Reading It Aloud Can Make It More Memorable—But Not More Understood
7–10 minutes -
Student/Studying Interface Learning Manual: Formula & Reference-Sheet Interface | Having the Formula Is Not the Same as Knowing When It Applies
4–6 minutes -
Student/Studying Interface Learning Manual: Translation Tool Interface | A Translation Can Help You Re-enter the Lesson Without Replacing the Lesson
4–5 minutes -
Student/Studying Interface Learning Manual: Citation & Attribution Interface | Using a Source Is Not Finished Until the Reader Can Trace It
3–5 minutes -
Student/Studying Interface Learning Manual: Submission Preflight Interface | Finished Work Is Not Finished Until the Right Thing Actually Leaves
4–6 minutes -
Bolt Measurement Note 24 — Live and Video Observations Can Score the Same Teaching Differently
6–10 minutes -
Student/Studying Interface Learning Manual: Voice-Note Interface | A Good Explanation Can Disappear Inside a 12-Minute Recording
4–6 minutes -
Bolt Measurement Note 23 — Human-Like Agreement Does Not Make an AI Marker Valid
6–9 minutes -
Student/Studying Interface Learning Manual: Offline Study Pack Interface | No Internet Should Not Mean No Study Route
4–6 minutes -
Student/Studying Interface Learning Manual: Dictionary & Glossary Interface | Looking Up a Word Is Not the Same as Rejoining the Sentence
4–6 minutes -
Bolt Measurement Note 22 — The Students Who Raise Their Hands Are Not the Whole Class
6–8 minutes -
Student/Studying Interface Learning Manual: Photo-Capture Interface | A Photograph Can Save the Page and Lose the Study State
3–5 minutes -
Bolt Measurement Note 21 — A Test Question Can Behave Differently for Comparable Groups
6–9 minutes -
Student/Studying Interface Learning Manual: PDF Study Interface | A 90-Page PDF Is Not a 90-Page Study Plan
4–6 minutes -
Student/Studying Interface Learning Manual: Cross-Device Study Interface | Moving From Laptop to Paper to Phone Should Not Erase the Study State
5–7 minutes -
Student/Studying Interface Learning Manual: Study-Switch Interface | Changing Subject Is a Handoff, Not Just a New Tab
4–6 minutes -
Student/Studying Interface Learning Manual: Source-Trail Interface | If You Cannot Find Where a Fact Came From, You Cannot Reopen the Route
4–6 minutes -
Student/Studying Interface Learning Manual: Calculator Interface | A Correct Display Is Not Yet a Usable Study Record
4–6 minutes -
MindOS Learning Manual: Counterexample-Generation State | Can You Find the Case That Breaks the Rule?
5–7 minutes -
MindOS Learning Manual: Problem-Decomposition State | A Hard Problem May Be Several Smaller Problems Hiding Together
6–9 minutes -
Student/Studying Interface Learning Manual: Annotation Interface | Highlighting Can Leave a Beautiful Page and No Restart Point
4–6 minutes -
MindOS Learning Manual: Deliberate-Error State | Can Making a Wrong Answer on Purpose Help You Learn?
5–7 minutes -
MindOS Learning Manual: Learner-Generated Outlining State | Can You See the Hierarchy Inside the Text?
5–7 minutes -
MindOS Learning Manual: Solution-Verification State | Can You Check an Answer Without Repeating the Same Mistake?
5–7 minutes -
MindOS Learning Manual: Rule-Induction State | Can You Discover the Rule Without Being Told the Rule?
5–8 minutes -
MindOS Learning Manual: Subgoal-Decomposition State | Can You Break a Complex Problem Into Useful Parts?
5–7 minutes -
MindOS Learning Manual: Concept-Mapping State | A Diagram Helps Only If the Relationships Are Doing the Work
5–7 minutes -
Bolt Measurement Note 20 — Question Order Can Change the Performance You Measure
5–8 minutes -
Bolt Measurement Note 19 — The Marker Can Drift Even When the Rubric Does Not
5–7 minutes -
Bolt Measurement Note 18 — Crossing a Grade Boundary Does Not Create a Sudden Jump in Capability
6–8 minutes -
Bolt Measurement Note 17 — One Classroom Observation Is Not the Teacher
6–9 minutes -
Student/Studying Interface Learning Manual: AI Study-Thread Interface | A Helpful Chat Can Still Lose the Study Job
6–9 minutes -
Student/Studying Interface Learning Manual: Deadline-to-Session Interface | A Due Date Is Not a Study Plan
4–6 minutes -
Bolt Measurement Note 16 — Student Feedback About Teaching Is Evidence, Not a Verdict
6–9 minutes -
Student/Studying Interface Learning Manual: Practice-Set Interface | A Worksheet Does Not Tell You Which Questions Belong in This Session
4–7 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.
