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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Primary 6 Science Tuition | Careless Mistakes, Timing and Examination Control
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Primary 6 Science Tuition | For Beginners | Master Primary 6 Science Tuition for Beginners Today
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Primary 6 Science Tuition | Graphs, Tables and Data Interpretation for PSLE
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Primary 6 Science Tuition | How Do Adaptations Help Living Things Survive?
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Primary 6 Science Tuition | How Does Conservation Protect Ecosystems?
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Primary 6 Science Tuition | How Does Energy Change Form in Everyday Devices?
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Primary 6 Science Tuition | How Does Pollution Change a Food Web?
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Primary 6 Science Tuition | How to Answer Open-Ended Questions for PSLE with eduKate Sengkang
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Primary 6 Science Tuition | How to Explain Food Web Population Changes
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Primary 6 Science Tuition | What Happens When a Habitat Is Destroyed?
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Primary 6 Science Tuition | What Happens When Forces Are Balanced or Unbalanced?
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Primary 6 Science Tuition | Why Do Living Things Compete for Food, Water, Light and Space?
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Primary 6 Science Tuition | Why Do Objects Fall? Gravity, Weight and Motion
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Primary 6 Science Tuition | Why Do Rough Surfaces Create More Friction?
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Primary 6 Science Tuition | Why Does a Bouncing Ball Lose Height?
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Primary 6 Science Tuition | Why Does a Stretched Spring Return? Elastic Spring Force
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Primary 6 Science Tuition | Why Is the Sun the Main Source of Energy in Food Chains?
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Primary 6 Science Tutor | Curie Series | Energy, Forces, Environment and PSLE Integration
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Primary 6 Science | Reconstruct the World Before You Answer | Darwin × Voyage
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Primary 6 Tuition Sengkang | PSLE Readiness, Exam Control & the Secondary Transition
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Primary English Learning Hub | Primary 1–6 English Guides
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Primary English Sengkang | Which Part Is Actually Weak?
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Primary English Tuition Punggol | P1–P6: Find Your Child’s Stage
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Primary English Tuition Sengkang | P1–P6 Language Capability Map
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Primary Mathematics Punggol | Local Entry to the P1–P6 Math System
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Primary Mathematics Sengkang | Catch Up, Keep Up or Move Ahead?
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Primary Mathematics Sengkang | The P1–P6 Capability Map
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Primary Mathematics Success | 7 Signs the Learning System Is Actually Improving
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Primary Mathematics to Secondary 1 | Why the Learning Method Must Evolve | Darwin × Voyage
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Primary Mathematics Tuition Punggol | P1–P6: Foundations to PSLE
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Primary Science Sengkang | 8 Capabilities Behind Strong Science
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Primary Science Tuition Punggol | P3–P6: Observe → Relate → Systems → Reconstruct
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Primary Science Tuition Sengkang | Managing Education
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Primary Science Tuition Sengkang | P3–P6: Observe → Relate → Systems → Reconstruct
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Primary Science Tuition Sengkang | The Next Clear Step
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Primary Science | Complete P1–P6 and PSLE Science Guide
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Primary Tuition Sengkang | P1–P6 Learning Progression, Subjects & Parent Guide
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Professional Adulthood Tutor | Curie Series | From Competence to Judgement
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Professional Practice & Standards Tutor | Curie Series | Learning to Work Within Standards
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Prompt Dependence | Marie Curie Series | When Correct Work Is Not Yet Independent
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PSLE English 2026 | What the Examination Requires Students to Do
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PSLE English AL1 | Why Ten Tips Are Not Enough | Voyage to Examination Craft
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PSLE English Preparation | The Intervention Window Gets Smaller
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PSLE English Sengkang | The Voyage of Water — Meaning Under Uncertainty
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PSLE English Sengkang | Why 3-Pax Helps Mark Conversion
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PSLE English Tuition Centre Sengkang | Diagnostic Checklist
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PSLE English Tuition Sengkang | What to Repair Before More Papers
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PSLE English | From Language Capability to Examination Craft
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PSLE Exam Day Routine: Sleep, Food, Stationery, the First Five Minutes
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PSLE Learning Guide | English, Mathematics & Science
Browse every published Post
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PSLE Science Reality Lab Vol No.344 | “Planet Equilibrium Temperature = 300 K” — Is the Surface Really 300 K?
9–13 minutes -
PSLE Science Reality Lab Vol No.343 | “Water Year 2026” — Did It Begin on 1 January 2026?
10–15 minutes -
PSLE Science Reality Lab Vol No.342 | “NRR 30 dB” — Will Earplugs Always Make the Sound 30 dB Quieter?
7–11 minutes -
PSLE Science Reality Lab Vol No.341 | “Water Resistant 10 Bar” — Does That Mean the Watch Is Safe for Any Activity at 100 m?
7–10 minutes -
PSLE Science Reality Lab Vol No.340 | “Battery Charge Rate = 1C” — Does That Mean Exactly One Hour to Full Charge?
7–10 minutes -
PSLE Science Reality Lab Vol No.339 | “48 MP Camera” — Does It Capture Four Times More Real Detail Than a 12 MP Camera?
8–11 minutes -
PSLE Science Reality Lab Vol No.338 | “ISO/IEC 17025 Accredited Laboratory” — Is Every Test the Lab Performs Accredited?
8–13 minutes -
PSLE Science Reality Lab Vol No.337 | “Magnitude 7 Earthquake” — Is It Just Seven Times a Magnitude 1?
8–12 minutes -
PSLE Science Reality Lab Vol No.336 | “HEPA: 99.97% at 0.3 µm” — Is 0.3 µm the Smallest Particle It Can Catch?
9–13 minutes -
PSLE Science Reality Lab Vol No.335 | “This Satellite Image Is Bright Red” — Is the Forest Really Red?
10–15 minutes -
PSLE Science Reality Lab Vol No.334 | “UL Listed” — Does That Mean the Product Can Never Fail or Be Unsafe?
9–13 minutes -
PSLE Science Reality Lab Vol No.333 | “This Paper Has a Correction” — Does That Mean the Whole Study Is Invalid?
8–12 minutes -
PSLE Science Reality Lab Vol No.332 | “This Study Was Preregistered” — Does That Mean the Result Must Be Correct?
8–12 minutes -
PSLE Science Reality Lab Vol No.331 | “SPF 50” — Does That Mean 50 Times Longer in the Sun?
8–13 minutes -
PSLE Science Reality Lab Vol No.330 | “NSF/ANSI 53 Certified Water Filter” — Does It Remove Every Contaminant?
9–13 minutes -
PSLE Science Reality Lab Vol No.329 | “Streamflow = 10th Percentile” — Is the River Flowing at 10% of Normal?
9–13 minutes -
PSLE Science Reality Lab Vol No.328 | “Fire Radiative Power = 50 MW” — Is the Whole Wildfire Producing Exactly 50 MW?
8–12 minutes -
PSLE Science Reality Lab Vol No.327 | “ENERGY STAR Score = 75” — Is the Building 75% Efficient?
9–13 minutes -
PSLE Science Reality Lab Vol No.326 | “Biodegradation = 70% in 28 Days” — Did 70% of the Object Visibly Disappear Everywhere?
13–19 minutes -
PSLE Science Reality Lab Vol No.325 | “Control = 100%” — Does 150% Mean the Treatment Had 150 Units?
12–17 minutes -
PSLE Science Reality Lab Vol No.324 | “DNA Barcode Match = 99%” — Does That Prove It Is Species A?
11–16 minutes -
PSLE Science Reality Lab Vol No.323 | “The Recorder Detected 500 Calls” — Were 500 Animals There?
11–17 minutes -
PSLE Science Reality Lab Vol No.322 | “Kills 99.9% of Germs” — Does That Mean 99.9% of Every Germ Dies in Every Use?
10–15 minutes -
PSLE Science Reality Lab Vol No.321 | “Plastic Code 1 in a Triangle” — Does That Guarantee It Can Be Recycled Here?
10–15 minutes -
PSLE Science Reality Lab Vol No.320 | “Fire Perimeter = 10,000 ha” — Did All 10,000 ha Burn?
10–15 minutes -
PSLE Science Reality Lab Vol No.319 | “NDVI = 0.8” — Is 80% of the Ground Covered by Vegetation?
11–16 minutes -
PSLE Science Reality Lab Vol No.318 | “80% Biobased Content” — Is 80% of the Whole Product’s Mass Plant Material?
9–14 minutes -
PSLE Science Reality Lab Vol No.317 | “Planetary Kp = 7” — Is Earth’s Magnetic Field Seven Times More Disturbed Than at Kp 1?
9–13 minutes -
PSLE Science Reality Lab Vol No.316 | “Water Storage Anomaly = −10 cm” — Did the Groundwater Table Fall by 10 cm?
10–15 minutes -
PSLE Science Reality Lab Vol No.315 | “10-10-10 Fertilizer” — Is It 10% Nitrogen, 10% Elemental Phosphorus and 10% Elemental Potassium?
9–14 minutes -
PSLE Science Reality Lab Vol No.314 | “Sea-Surface Height Anomaly = +10 cm” — Is the Ocean 10 cm Higher Everywhere?
11–17 minutes -
PSLE Science Reality Lab Vol No.313 | “Cloud Optical Thickness = 20” — Is the Cloud 20 km Thick?
10–16 minutes -
PSLE Science Reality Lab Vol No.312 | “Leaf Area Index = 3” — Does That Mean Three Leaves per Square Metre or 300% Ground Cover?
11–17 minutes -
PSLE Science Reality Lab Vol No.311 | “Transit Depth = 1%” — Is the Planet 1% as Wide as Its Star?
10–15 minutes -
PSLE Science Reality Lab Vol No.310 | “CO₂ = 800 ppm” — Is That 800 mg of CO₂ per Cubic Metre?
9–13 minutes -
PSLE Science Reality Lab Vol No.309 | “20 Heating Degree Days” — Were There 20 Cold Days?
8–11 minutes -
PSLE Science Reality Lab Vol No.308 | “WBGT = 30°C” — Did One Thermometer Measure 30°C Air?
8–12 minutes -
PSLE Science Reality Lab Vol No.307 | “Noise Dose = 100%” — Is the Sound Level 100 dBA?
9–13 minutes -
PSLE Science Reality Lab Vol No.306 | “Base Peak = 100” — Is the Sample 100% That Fragment?
10–15 minutes -
PSLE Science Reality Lab Vol No.305 | “1000× Magnification” — Does That Mean 1000× More Detail?
9–14 minutes -
PSLE Science Reality Lab Vol No.304 | “RSD = 2%” — Does That Mean the Method Is 98% Accurate?
10–14 minutes -
PSLE Science Reality Lab Vol No.303 | “SPAD = 40” — Is the Leaf 40% Chlorophyll?
11–17 minutes -
PSLE Science Reality Lab Vol No.302 | “OD600 = 1.0” — Does That Mean Exactly One Billion Cells per Millilitre?
11–17 minutes -
PSLE Science Reality Lab Vol No.301 | “Passed 1,000 Hours of Salt Spray” — Does That Mean 1,000 Hours of Real-World Life?
10–15 minutes -
PSLE Science Reality Lab Vol No.300 | “Geiger Counter = 120 CPM” — Is That 120 µSv/h of Radiation Dose?
11–17 minutes -
PSLE Science Reality Lab Vol No.299 | “Calibration Chart: R² = 0.99” — Is the Method 99% Accurate?
13–19 minutes -
PSLE Science Reality Lab Vol No.298 | “Catch per Unit Effort Went Up” — Does That Prove There Are More Fish?
11–16 minutes -
PSLE Science Reality Lab Vol No.297 | “Treadwear 400” — Will the Tire Last Exactly Four Times as Long on Any Road?
10–15 minutes -
PSLE Science Reality Lab Vol No.296 | “9H Pencil Hardness” — Is This Coating as Hard as Mohs 9?
10–16 minutes -
PSLE Science Reality Lab Vol No.295 | “Sensor Sensitivity = 20 mV/°C” — Is the Sensor 20% Accurate?
12–18 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.
