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 Mathematics Learning Guide | Completing the Square, Quadratic Formula and Graphical Solutions
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Secondary 4 Mathematics Learning Guide | Congruence, Similarity, Scale Drawings and Area-Volume Ratios
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Secondary 4 Mathematics Learning Guide | Coordinate Geometry and Transformations as Representation
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Secondary 4 Mathematics Learning Guide | Coordinate Geometry: Segment Length, Straight-Line Equations and Geometric Problem Solving
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Secondary 4 Mathematics Learning Guide | Cumulative Frequency, Box Plots and Standard Deviation
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Secondary 4 Mathematics Learning Guide | Data Collection, Classification, Tabulation and Choosing Statistical Representations
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Secondary 4 Mathematics Learning Guide | Dimensional Reasoning: Units, Compound Units, Scale, Area–Volume Conversion and Error Detection
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Secondary 4 Mathematics Learning Guide | Direct and Inverse Proportion, Scale and Rate Models
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Secondary 4 Mathematics Learning Guide | Distance-Time and Speed-Time Graphs: Motion, Rate and Interpretation
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Secondary 4 Mathematics Learning Guide | Error Analysis, Corrections and Full-Paper Recovery
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Secondary 4 Mathematics Learning Guide | Formulae Provided, Working Required: Formula-Sheet Intelligence, Essential Working, Accuracy and Calculator Control
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Secondary 4 Mathematics Learning Guide | Fractional Equations Reduced to Linear and Quadratic Equations
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Secondary 4 Mathematics Learning Guide | Fractional Indices, Roots and Exact Powers
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Secondary 4 Mathematics Learning Guide | Geometrical Constructions, Bisectors and Constraint Diagrams
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Secondary 4 Mathematics Learning Guide | Geometry, Trigonometry and Measurement as a Constraint System
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Secondary 4 Mathematics Learning Guide | Gradient of Curves: Tangents, Local Rate of Change and Graphical Estimation
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Secondary 4 Mathematics Learning Guide | Grouped Data: Mean, Standard Deviation, Quartiles, Percentiles and Comparing Distributions
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Secondary 4 Mathematics Learning Guide | Histograms, Statistical Diagrams and Misleading Data
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Secondary 4 Mathematics Learning Guide | Indices, Standard Form and Exact Number Structure
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Secondary 4 Mathematics Learning Guide | Linear Graphs, Gradient, Intercepts and Rate of Change
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Secondary 4 Mathematics Learning Guide | Linear Inequalities, Number Lines and Boundary Reasoning
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Secondary 4 Mathematics Learning Guide | Mathematical Notation as an Operational Language: Equality, Approximation, Proportion, Inequalities, Sets and Vectors
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Secondary 4 Mathematics Learning Guide | Matrices, Data and Matrix Operations
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Secondary 4 Mathematics Learning Guide | Mean, Median, Mode, Range and Comparing Data Sets
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Secondary 4 Mathematics Learning Guide | Mensuration, Radians and Composite Solids
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Secondary 4 Mathematics Learning Guide | Past-Paper Forensics: Question Archetypes, First Failure, Error Ledgers and Transfer Retests
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Secondary 4 Mathematics Learning Guide | Personal and Household Finance: Interest, Taxation, Instalments, Utilities and Money Exchange
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Secondary 4 Mathematics Learning Guide | Power, Reciprocal and Exponential Graphs
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Secondary 4 Mathematics Learning Guide | Prime Factors, HCF, LCM and Divisibility Structure
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Secondary 4 Mathematics Learning Guide | Probability Event Logic: When to Add, Multiply, Subtract from One or Change the Denominator
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Secondary 4 Mathematics Learning Guide | Probability, Combined Events and Tree Diagrams
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Secondary 4 Mathematics Learning Guide | Pythagoras, Right-Triangle Trigonometry and Three-Dimensional Reasoning
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Secondary 4 Mathematics Learning Guide | Quadratic Equations and Algebraic Fractions
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Secondary 4 Mathematics Learning Guide | Quadratic Functions: Forms, Roots, Turning Points and Symmetry
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Secondary 4 Mathematics Learning Guide | Ratio, Percentage, Rates and Financial Mathematics
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Secondary 4 Mathematics Learning Guide | Real-World Geometry: Floor Plans, Surveying, Navigation and Interpretation
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Secondary 4 Mathematics Learning Guide | Reverse Percentages, Percentage Comparison and Repeated Change
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Secondary 4 Mathematics Learning Guide | Set Language, Venn Diagrams and Counting
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Secondary 4 Mathematics Learning Guide | Simultaneous Linear Equations, Intersections and Modelling
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Secondary 4 Mathematics Learning Guide | Statistics, Probability and Real-World Problems Under Exam Conditions
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Secondary 4 Mathematics Learning Guide | The Final Paper 2 Real-World Scenario: Model, Solve, Verify and Communicate
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Secondary 4 Mathematics Learning Guide | Vectors as Representation: Directed Segments, Position Vectors, Magnitude, Scalar Multiples and Translation
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Secondary 4 Mathematics Learning Guide | Vectors, Ratios and Collinearity
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Secondary 4 Mathematics Punggol | GCE 2026 to SEC 2027 Legacy Entry
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Secondary 4 Mathematics Sengkang | GCE 2026 or SEC 2027? Know Your Cohort
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Secondary 4 Mathematics Sengkang | GCE 2026 to SEC 2027 Transition
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Secondary 4 Mathematics Sengkang | The Voyage of Water
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Secondary 4 Mathematics Tuition Sengkang | SEC 2027+ Exam Preparation
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Secondary 4 Mathematics Tutor | Curie Series | Integration, SEC and the Handover Beyond Secondary School
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Secondary 4 Science Tutor | Curie Series | SEC Integration, Evidence and the Handover Beyond Secondary School
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.
