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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PSLE Science Reality Lab Vol No.463 | “Radiocarbon Age = 3000 BP” — Is That Simply 3000 Years Before 2026?
10–15 minutes -
PSLE Science Reality Lab Vol No.462 | “Surrogate Recovery = 82%” — Does That Mean 82% of the Target Chemical Was Recovered?
15–22 minutes -
PSLE Science Reality Lab Vol No.461 | “Maximum Intensity Projection” — Does One 2D Image Show Everything at the Same Depth?
15–22 minutes -
PSLE Science Reality Lab Vol No.460 | “Linearity = ±0.2%” — Does That Mean Every Reading Is Accurate to Within 0.2%?
9–13 minutes -
PSLE Science Reality Lab Vol No.459 | “Pixel Value = 65535” — Is That the Exact Brightness, or Has the Detector Saturated?
9–14 minutes -
PSLE Science Reality Lab Vol No.458 | “98% Accurate on the Training Data” — Has the Model Proven It Can Predict New Cases?
11–16 minutes -
PSLE Science Reality Lab Vol No.457 | “12-Month Running Mean” — Did the Raw Measurements Really Change That Smoothly?
11–17 minutes -
PSLE Science Reality Lab Vol No.456 | “HDOP = 0.8” — Does That Mean the GPS Error Is 0.8 Metres?
21–31 minutes -
PSLE Science Reality Lab Vol No.455 | “This Fluorescence Image Is Bright Green” — Were the Cells Naturally Green?
10–15 minutes -
PSLE Science Reality Lab Vol No.454 | “Orthorectified Image” — Is Every Pixel Now in Exactly the Right Place?
10–15 minutes -
PSLE Science Reality Lab Vol No.453 | “NoData = −9999” — Did the Sensor Measure Minus 9999?
11–17 minutes -
PSLE Science Reality Lab Vol No.452 | “11 Spectral Bands” — Is That Sensor Automatically Better Than One With 4?
14–21 minutes -
PSLE Science Reality Lab Vol No.451 | “Swath Width = 185 km” — Does One Satellite Pixel Cover 185 km?
13–20 minutes -
PSLE Science Reality Lab Vol No.450 | “LOD90 = 2 ng” — Is Everything Above 2 ng Always Detected?
9–14 minutes -
PSLE Science Reality Lab Vol No.449 | “Checksum Matches” — Does That Prove the Scientific Data Are Correct?
10–15 minutes -
PSLE Science Reality Lab Vol No.448 | “The Green Band Gets Thinner” — Did That Scientific Quantity Decrease?
14–21 minutes -
PSLE Science Reality Lab Vol No.447 | “This Bubble Looks Twice as Wide” — Does It Represent Twice the Value?
13–20 minutes -
PSLE Science Reality Lab Vol No.446 | “Type Approved” — Was Every Individual Instrument Tested?
14–20 minutes -
PSLE Science Reality Lab Vol No.445 | “Self-Test: PASS” — Does That Mean Every Measurement Is Accurate?
16–24 minutes -
PSLE Science Reality Lab Vol No.444 | “Registered Report: Accepted in Principle” — Were the Results Already Confirmed?
18–27 minutes -
PSLE Science Reality Lab Vol No.443 | “Three Laboratories Agree” — Does Agreement Prove the Result Is Accurate?
18–27 minutes -
PSLE Science Reality Lab Vol No.442 | “Expression of Concern” — Has the Study Already Been Retracted?
13–19 minutes -
PSLE Science Reality Lab Vol No.441 | “Open Access Article” — Does That Mean the Research Data Are Open Too?
10–16 minutes -
PSLE Science Reality Lab Vol No.440 | “Dataset Version 4.0” — Is It Four Times More Accurate Than Version 1.0?
10–15 minutes -
PSLE Science Reality Lab Vol No.439 | “This Paper Has a DOI” — Does That Mean It Was Peer Reviewed?
11–16 minutes -
PSLE Science Reality Lab Vol No.437 | “Consensus Study Report” — Does That Mean Every Scientist Agrees?
13–19 minutes -
PSLE Science Reality Lab Vol No.436 | “Systematic Review” — Does That Mean It Found Every Study Ever Done?
9–14 minutes -
PSLE Science Reality Lab Vol No.435 | “Clinically Tested” — Does That Mean the Product Was Shown to Work?
10–15 minutes -
How Independent Performance Works | Knowing What the Learner Can Do When Support Is Gone
12–18 minutes -
How Assessment for Teaching Works | Turning Evidence Into Better Instruction Before, During and After Learning
85–127 minutes -
How Small-Group Teaching Works | Shared Instruction, Individual Evidence and Three-Learner Precision
12–18 minutes -
How Adaptive Teaching Works | Changing the Next Move Without Lowering the Learning Goal
34–50 minutes -
Top 10 Resilience Skills Worth Learning
9–13 minutes -
Top 10 Uncertainty Skills Worth Learning
8–11 minutes -
How Transfer Works in Teaching | Designing Practice That Makes Knowledge Travel to New Problems
18–27 minutes -
Top 10 Observation Skills Worth Learning
8–12 minutes -
PSLE Science Reality Lab Vol No.434 | “Percent Bias = +2%” — Is Every Reading Exactly 2% Too High?
11–17 minutes -
PSLE Science Reality Lab Vol No.433 | “Scene Cloud Cover = 10%” — Is My Target Area 90% Clear?
11–16 minutes -
PSLE Science Reality Lab Vol No.432 | “Pressure Altitude = 2,000 ft” — Is That Exactly 2,000 ft Above Sea Level?
12–18 minutes -
PSLE Science Reality Lab Vol No.431 | “Charted Depth = 5 m” — Is the Water 5 m Deep Right Now?
13–19 minutes -
PSLE Science Reality Lab Vol No.430 | “8 g Sugar per Serving” — Does the Whole Pack Contain 8 g?
11–17 minutes -
PSLE Science Reality Lab Vol No.429 | “Four Equal-Looking Map Colours” — Are the Four Number Ranges Equal Too?
11–16 minutes -
PSLE Science Reality Lab Vol No.428 | “Meets Drinking-Water Standards” — Does That Mean Every Contaminant Is Zero?
11–16 minutes -
PSLE Science Reality Lab Vol No.427 | “24-Hour PSI = 100” — Is the Pollutant Concentration 100 µg/m³ Right Now?
12–18 minutes -
PSLE Science Reality Lab Vol No.426 | “ISO 14001 Certified” — Does That Mean Every Product Is Environmentally Friendly?
13–19 minutes -
PSLE Science Reality Lab Vol No.425 | “Verified Environmental Product Declaration” — Does That Prove the Product Is Environmentally Better?
9–14 minutes -
PSLE Science Reality Lab Vol No.424 | “N95” — Does 95 Mean It Blocks 95% of Every Airborne Particle in Every Use?
8–12 minutes -
PSLE Science Reality Lab Vol No.423 | “4-Tick WELS Washing Machine” — Does Four Ticks Mean It Uses One Quarter as Much Water?
12–17 minutes -
PSLE Science Reality Lab Vol No.422 | “Sample Rate = 1 Reading/s” — Can the Sensor Track Every One-Second Change?
12–18 minutes -
PSLE Science Reality Lab Vol No.421 | “Accuracy = ±2% RH at 23°C” — Does That Same Accuracy Claim Apply at Every Temperature?
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.
