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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PSLE Science Reality Lab Vol No.381 | “As Found: Out of Tolerance; As Left: In Tolerance” — Which State Describes the Measurements Made Before Calibration?
8–12 minutes -
PSLE Science Reality Lab Vol No.380 | “Dead Band = 0.2 Units” — Can the Measured Quantity Change While the Display Stays the Same?
7–10 minutes -
PSLE Science Reality Lab Vol No.379 | “Hysteresis = 0.5% FS” — Can the Same Input Give Different Readings Depending on Which Direction It Came From?
8–12 minutes -
PSLE Science Reality Lab Vol No.378 | “The Sensor Passed Its Zero Check” — Is It Accurate Across the Whole Range?
9–13 minutes -
PSLE Science Reality Lab Vol No.377 | “n = 3 Technical Replicates” — Were There Three Independent Samples?
9–13 minutes -
PSLE Science Reality Lab Vol No.376 | “20 mg/kg Dry Weight” — Is That 20 mg/kg in the Wet Sample Too?
8–12 minutes -
PSLE Science Reality Lab Vol No.375 | “24-Hour Composite Sample = 5 mg/L” — Was the Water 5 mg/L All Day?
9–14 minutes -
PSLE Science Reality Lab Vol No.373 | “High-Impact Journal” — Does the Journal Name Prove This Result Is Stronger?
9–14 minutes -
PSLE Science Reality Lab Vol No.372 | “The Abstract Says It Worked” — Have We Seen Enough of the Study to Judge the Claim?
9–14 minutes -
PSLE Science Reality Lab Vol No.371 | “Independently Tested” — Which Part of the Evidence Was Actually Independent?
11–17 minutes -
PSLE Science Reality Lab Vol No.370 | “GPS Altitude = 100 m” — Is That Automatically 100 m Above Mean Sea Level?
10–14 minutes -
PSLE Science Reality Lab Vol No.369 | “UL 94 V-0” — Does That Mean the Plastic Is Fireproof?
9–13 minutes -
PSLE Science Reality Lab Vol No.368 | “DC Fast Charging Up to 250 kW” — Will It Charge at 250 kW the Whole Time?
10–15 minutes -
PSLE Science Reality Lab Vol No.367 | “Tested to MIL-STD-810H” — Was the Product Tested Against Every Harsh Environment?
10–15 minutes -
PSLE Science Reality Lab Vol No.366 | “Contour Line = 100 m” — Is Everything Inside the Line Exactly 100 m High?
13–19 minutes -
PSLE Science Reality Lab Vol No.365 | “Nitrate = 10 mg/L as N” — Is There 10 mg of Nitrate Ion in Each Litre?
8–13 minutes -
PSLE Science Reality Lab Vol No.364 | “230 V AC” — Is the Voltage 230 V at Every Instant?
9–13 minutes -
PSLE Science Reality Lab Vol No.363 | “VEI 6” — Is It Six Times as Explosive as VEI 1?
10–15 minutes -
How to Improve Time Management | Protect High-Value Work, Budget Attention and Finish What Matters
8–12 minutes -
How to Improve Curiosity | Turn Information Gaps Into Better Questions, Exploration and Learning
7–11 minutes -
How to Improve Confidence | Build Accurate Self-Trust From Evidence, Practice and Recovery
7–10 minutes -
How to Improve Questioning | Ask Better Questions, Find Better Information and Use the Answer
9–13 minutes -
Exact Determinant Calculation: A Worked Casebook for Exact Linear Algebra
4–6 minutes -
How to Improve Students | Why Students Start Exams Too Slowly Even When They Know the Work
14–22 minutes -
How to Improve Students | Why Untimed Accuracy Disappears When the Clock Starts
15–22 minutes -
How to Improve Students | Why Students Answer the Topic Instead of the Exact Question
16–24 minutes -
How to Improve Students | Why Students Practise Only the Hardest Questions and Lose Ordinary Marks
18–27 minutes -
How to Improve Students | Why Students Use the Right Method on the Wrong Question
6–8 minutes -
How to Improve Students | Why Students Cannot Restart a Question After Getting Stuck
6–9 minutes -
How to Improve Students | Why Students Fix Easy Errors Before High-Cost Errors
6–9 minutes -
How to Improve Students | Why Students Spend Too Long Checking Answers They Already Know
7–10 minutes -
PSLE Science Reality Lab Vol No.362 | “Galaxy Redshift z = 2” — Does the Galaxy Look Twice as Red?
9–14 minutes -
PSLE Science Reality Lab Vol No.361 | “High Signal-to-Noise Ratio” — Does a Cleaner Signal Prove the Measurement Is Accurate?
9–14 minutes -
PSLE Science Reality Lab Vol No.360 | “Tsunami Runup = 5 m” — Was the Offshore Wave 5 m Tall?
9–14 minutes -
PSLE Science Reality Lab Vol No.359 | “Sea Ice Extent = 10 Million km²” — Is Every Square Kilometre Fully Covered by Ice?
10–15 minutes -
How to Improve Goal Setting | Turn Ambition Into a Target, a Next Action and Evidence of Progress
14–21 minutes -
PSLE Science Reality Lab Vol No.358 | “Cloud Ceiling = 500 ft” — Are All the Clouds 500 ft Above the Ground?
8–12 minutes -
PSLE Science Reality Lab Vol No.357 | “Battery Specific Energy = 250 Wh/kg” — Does a 2 kg Battery Always Store 500 Wh?
9–14 minutes -
PSLE Science Reality Lab Vol No.356 | “U = 0.4°C, k = 2” — Does k = 2 Mean the Thermometer Can Be Wrong by 2°C?
8–11 minutes -
PSLE Science Reality Lab Vol No.355 | “ShakeMap Intensity = VI” — Was It a Magnitude 6 Earthquake?
8–12 minutes -
PSLE Science Reality Lab Vol No.354 | “Baseflow Index = 60%” — Is 60% of the River Groundwater at Every Moment?
8–11 minutes -
PSLE Science Reality Lab Vol No.353 | “D50 = 20 µm” — Are Half the Particles Exactly 20 µm Wide?
8–12 minutes -
PSLE Science Reality Lab Vol No.352 | “LAeq = 70 dB” — Was the Sound 70 dB the Whole Time?
8–12 minutes -
PSLE Science Reality Lab Vol No.351 | “100 MPGe” — Did the Electric Car Use One Gallon of Gasoline to Travel 100 Miles?
8–13 minutes -
PSLE Science Reality Lab Vol No.350 | “Beaufort Force 8” — Is the Wind Blowing at 8 m/s?
9–13 minutes -
PSLE Science Reality Lab Vol No.349 | “Solar Panel Efficiency = 22%” — Does the Other 78% Become Waste Heat?
9–14 minutes -
PSLE Science Reality Lab Vol No.348 | “This Global Satellite Image Was Taken Today” — Was Every Pixel Captured at the Same Moment?
8–12 minutes -
PSLE Science Reality Lab Vol No.347 | “Ocean Heat Content Anomaly = +100 ZJ” — Is the Ocean 100°C Hotter?
10–15 minutes -
PSLE Science Reality Lab Vol No.346 | “Drag Coefficient = 0.30” — Does That Mean 30% of the Force Is Drag?
14–21 minutes -
PSLE Science Reality Lab Vol No.345 | “CAPE = 3000 J/kg” — Is a Severe Thunderstorm Guaranteed?
10–14 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.
