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 4 Additional Mathematics Learning Guide | Verification, Timing and Examination Recovery
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Secondary 4 Additional Mathematics Learning Guide | Worked Solutions, Hint Fading and Independent Reconstruction
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Secondary 4 Additional Mathematics Sengkang | The Voyage of Water
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Secondary 4 Additional Mathematics Tuition Sengkang | SEC 2027+ A-Math
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Secondary 4 English Examination Preparation | Protect the Working System
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Secondary 4 English Learning Guide | Argument, Evaluation and Discursive Writing
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Secondary 4 English Learning Guide | Comprehension Question Types and Answer Precision
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Secondary 4 English Learning Guide | Continuous Writing: Prompt Choice, Development, Style and Timed Revision
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Secondary 4 English Learning Guide | Editing, Situational Writing and Continuous Writing
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Secondary 4 English Learning Guide | Editing: Advanced Grammar, Sentence Boundaries and Error Control
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Secondary 4 English Learning Guide | Exam Error Analysis and Final Transfer
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Secondary 4 English Learning Guide | Language Effects: Word Choice, Imagery, Tone and Writer’s Perspective
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Secondary 4 English Learning Guide | Listening, Note-Taking and Real-Time Inference
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Secondary 4 English Learning Guide | Listening, Oral Communication, Vocabulary and Final Revision
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Secondary 4 English Learning Guide | Oral Communication: Planned Response, Spoken Interaction and Recovery
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Secondary 4 English Learning Guide | Reading, Comprehension, Inference and Summary Under Time
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Secondary 4 English Learning Guide | Situational Writing: Audience, Context, Information Transformation and Tone
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Secondary 4 English Learning Guide | Summary Mastery and Compression
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Secondary 4 English Learning Guide | The Last-Mile Examination Control System
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Secondary 4 English Learning Guide | Visual and Multimodal Text: Purpose, Layout, Evidence and Evaluation
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Secondary 4 English Learning Guide | Vocabulary in Context, Collocation, Register and Precision
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Secondary 4 English Sengkang | The Last-Mile Error Map
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Secondary 4 English Sengkang | The Voyage of Water
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Secondary 4 English Sengkang | Why 3-Pax Helps Last-Mile Examination Control
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Secondary 4 English Tuition at Punggol | O-Level Excellence with eduKate
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Secondary 4 English Tuition Sengkang | SEC 2027+ Exam Preparation
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Secondary 4 English Tutor | Curie Series | Integration, SEC and the Handover Beyond Secondary School
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Secondary 4 Mathematics 2026 | Final GCE Cohort Before SEC 2027 | Examination Craft
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Secondary 4 Mathematics Classroom | Chapter 1: Sets | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 2: Probability of Combined Events | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 3: Statistical Data Analysis | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 4: Matrices | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 5: Vectors | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 6: Numbers and Algebra Revision | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 7: Geometry and Measurement Revision | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter 8: Probability and Statistics Revision | SEC G3 K310
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Secondary 4 Mathematics Classroom | Chapter-by-Chapter Learning Route | SEC G3 K310
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Secondary 4 Mathematics Learning Guide | Accuracy, Estimation and Calculator Discipline
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Secondary 4 Mathematics Learning Guide | Algebra, Functions and Graphs Under Mixed-Topic Conditions
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Secondary 4 Mathematics Learning Guide | Algebraic Expansion, Factorisation and Equivalent Forms
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Secondary 4 Mathematics Learning Guide | Algebraic Formulae, nth-Term Patterns and Change of Subject
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Secondary 4 Mathematics Learning Guide | Algebraic Fractions: Multiply, Divide, Add and Subtract
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Secondary 4 Mathematics Learning Guide | Angles, Polygons, Parallel Lines and Symmetry
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Secondary 4 Mathematics Learning Guide | AO2 Model Building: Relevant Information, Assumptions, Constraints and Validation
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Secondary 4 Mathematics Learning Guide | AO2 Translation: From Words, Tables, Graphs and Diagrams to Mathematics
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Secondary 4 Mathematics Learning Guide | AO3 Mathematical Argument: Justification, Counterexamples, Evidence and Complete Explanations
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Secondary 4 Mathematics Learning Guide | Bearings, Sine Rule, Cosine Rule and Triangle Area
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Secondary 4 Mathematics Learning Guide | Boundary Cases and Admissible Solutions: Domains, Restrictions, Integer Constraints and Impossible Answers
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Secondary 4 Mathematics Learning Guide | Build an Examination Route Before You Calculate
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Secondary 4 Mathematics Learning Guide | Circle Theorems and Geometrical Proof
Browse every published Post
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PSLE Science Reality Lab Vol No.420 | “Aboveground Biomass = 150 Mg/ha” — Did Scientists Cut Down and Weigh Every Tree?
9–13 minutes -
PSLE Science Reality Lab Vol No.419 | “River Discharge = 120 m³/s at 06:00” — Was 120 m³/s Directly Measured at That Exact Moment?
11–16 minutes -
PSLE Science Reality Lab Vol No.418 | “Net Weight 500 g” — Was Every Pack Filled to Exactly 500.0 g?
10–15 minutes -
PSLE Science Reality Lab Vol No.417 | “The Microscope Image Is Purple and Pink” — Were the Cells Naturally Those Colours?
9–14 minutes -
PSLE Science Reality Lab Vol No.416 | “This Hillshade Is Dark on One Side” — Was That Slope in Shadow When the Data Were Collected?
10–14 minutes -
PSLE Science Reality Lab Vol No.415 | “Waterproof Fabric = 10,000 mm Hydrostatic Head” — Can You Take It 10 m Underwater?
11–16 minutes -
PSLE Science Reality Lab Vol No.414 | “Noise Cancelling = Up to 40 dB” — Will Every Sound Become 40 dB Quieter?
12–18 minutes -
PSLE Science Reality Lab Vol No.413 | “Washing Machine Capacity = 10 kg” — Does That Mean 10 kg of Any Laundry on Any Cycle?
10–15 minutes -
PSLE Science Reality Lab Vol No.412 | “Calibration Due: 30 September” — Is the Instrument Guaranteed Accurate Until That Date?
10–15 minutes -
PSLE Science Reality Lab Vol No.411 | “Dehumidifier Capacity = 20 L/day” — Will It Remove 20 Litres From the Room Every Day?
10–15 minutes -
PSLE Science Reality Lab Vol No.410 | “Microwave Oven = 1000 W” — Does It Draw Exactly 1000 W From the Wall?
8–12 minutes -
PSLE Science Reality Lab Vol No.409 | “12-Bit Satellite Data = 4096 Levels” — Is It 16 Times More Accurate Than 8-Bit Data?
8–12 minutes -
PSLE Science Reality Lab Vol No.408 | “Echo Sounder Says 20 m” — Is the Seabed Exactly 20 m Below the Water Surface?
8–12 minutes -
PSLE Science Reality Lab Vol No.407 | “NIST Traceable” — Did NIST Test, Approve or Certify This Instrument?
8–12 minutes -
PSLE Science Reality Lab Vol No.406 | “Error = +0.3°C; Correction = −0.3°C” — Why Do the Signs Point Opposite Ways?
12–18 minutes -
PSLE Science Reality Lab Vol No.405 | “ISO Class 5 Cleanroom” — Does Class 5 Mean Only Five Particles Are Allowed in the Room?
12–18 minutes -
PSLE Science Reality Lab Vol No.404 | “Magnitude 6.1, Then 5.8” — Did the Earthquake Become Smaller After It Happened?
11–16 minutes -
PSLE Science Reality Lab Vol No.403 | “Brightness Temperature = −43°C” — Did a Thermometer in the Cloud Measure −43°C?
14–21 minutes -
PSLE Science Reality Lab Vol No.402 | “Sound Power Level = 90 dB” — Will a Sound Meter Read 90 dB Wherever You Stand?
8–13 minutes -
PSLE Science Reality Lab Vol No.401 | “Gas Flow = 10 Standard L/min” — Are Exactly 10 Litres Passing Each Minute at the Actual Temperature and Pressure?
8–12 minutes -
PSLE Science Reality Lab Vol No.400 | “Battery Nominal Voltage = 3.6 V” — Is the Cell Always at 3.6 V?
8–12 minutes -
PSLE Science Reality Lab Vol No.399 | “2× Vertical Exaggeration” — Are the Slopes Really Twice as Steep?
8–13 minutes -
PSLE Science Reality Lab Vol No.398 | “Pan-Sharpened to 15 m” — Were All the Colour Bands Measured at 15 m?
10–15 minutes -
PSLE Science Reality Lab Vol No.397 | “The Trip Blank Contained Benzene” — Does That Prove the River Sample Contained Benzene?
10–15 minutes -
How to Improve Reading | Build Meaning, Test Inference, Expand Vocabulary and Read With Purpose
11–17 minutes -
PSLE Science Reality Lab Vol No.396 | “Both Thermal Images Show the Roof in Red” — Is It the Same Temperature in Both?
10–15 minutes -
PSLE Science Reality Lab Vol No.395 | “30 m Satellite Data Resampled to 10 m” — Did It Gain New 10 m Detail?
11–17 minutes -
PSLE Science Reality Lab Vol No.394 | “Proof Tested to 125% of Rated Load” — Does That Mean It Breaks at 125%?
8–12 minutes -
PSLE Science Reality Lab Vol No.393 | “Ensemble Mean Forecast” — Is That the One Most Likely Weather Scenario?
8–12 minutes -
PSLE Science Reality Lab Vol No.392 | “Mean ± SEM” — Do Those Tiny Error Bars Show How Much the Individual Results Varied?
8–12 minutes -
PSLE Science Reality Lab Vol No.391 | “Dissolved Metal = 8 µg/L” — Is That the Total Metal in the Water?
9–14 minutes -
Primary Science Cycles & Systems Tutor Sengkang | Life Cycles, Water, Plants & Interdependence
3–5 minutes -
Primary Science Heat & Light Tutor Sengkang | Temperature, Transfer, Shadows & Reflection
3–4 minutes -
Additional Mathematics Trigonometry Tutor Sengkang | Identities, Equations, Graphs & Radians
3–5 minutes -
Secondary English Grammar Tutor Sengkang | Tense, Clauses, Agreement, Cohesion & Sentence Control
3–5 minutes -
PSLE English Situational Writing Tutor Sengkang | Task Fulfilment, Audience, Purpose & Source Use
4–6 minutes -
Primary Science Energy & Forces Tutor Sengkang | Transfer, Motion, Friction, Magnets & Systems
6–9 minutes -
Additional Mathematics Calculus Tutor Sengkang | Differentiation, Integration, Tangents & Rates of Change
6–9 minutes -
Secondary English Vocabulary Tutor Sengkang | Academic Words, Collocations, Nuance & Transfer
6–9 minutes -
PSLE English Listening Comprehension Tutor Sengkang | Main Ideas, Details, Inference & Evaluation
6–9 minutes -
Primary Mathematics Ratio, Rate & Speed Tutor Sengkang | Relationships, Units & Multi-Step Problems
5–8 minutes -
PSLE Science Reality Lab Vol No.390 | “Checked Against Ground Truth” — Does Ground Truth Mean Error-Free Truth?
10–15 minutes -
PSLE Science Reality Lab Vol No.389 | “Model Run: 00Z; Valid: 12Z” — Which Time Does the Forecast Describe?
10–15 minutes -
PSLE Science Reality Lab Vol No.388 | “Accuracy: ±1% Full Scale” — Is That ±1% of Every Reading?
10–15 minutes -
PSLE Science Reality Lab Vol No.387 | “Satellite Data: Level 3” — Does Level 3 Mean It Is More Accurate Than Level 2?
12–19 minutes -
PSLE Science Reality Lab Vol No.386 | “Earthquake Alert = Red” — Does Red Mean the Earthquake Had the Biggest Magnitude?
9–13 minutes -
PSLE Science Reality Lab Vol No.385 | “40% Chance of Above-Normal Rainfall” — Does That Mean 40% More Rain?
8–13 minutes -
PSLE Science Reality Lab Vol No.384 | “1 m DEM” — Are the Elevation Values Accurate to 1 m?
9–14 minutes -
PSLE Science Reality Lab Vol No.383 | “Storm-Surge Map Says 6 ft” — Is 6 ft the Exact Flood Depth That Will Happen There?
11–16 minutes -
PSLE Science Reality Lab Vol No.382 | “The Probe Says 40°C” — Could the Act of Measuring Have Changed the Temperature?
8–12 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.
