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
2756 results found
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Primary 6 Mathematics Learning Guide | Money Applications: Discount, GST and Interest
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Primary 6 Mathematics Learning Guide | Multi-Step Word Problems and Model Selection
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Primary 6 Mathematics Learning Guide | Multiple Methods, Verification and Comparing Solution Routes
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Primary 6 Mathematics Learning Guide | Number Sense, Approximation, Estimation and Reasonableness
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Primary 6 Mathematics Learning Guide | Patterns, Rules, Generalisation and Invariant Thinking
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Primary 6 Mathematics Learning Guide | Primary 6 to Secondary 1 Mathematics Handover
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Primary 6 Mathematics Learning Guide | PSLE Error Analysis, Pacing and Exam Control
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Primary 6 Mathematics Learning Guide | Question Decomposition and Subgoals
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Primary 6 Mathematics Learning Guide | Rate, Unit Rate and Quantity per Unit
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Primary 6 Mathematics Learning Guide | Ratio, Percentage and Multiplicative Change
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Primary 6 Mathematics Learning Guide | Remainder Branching and Fractions of a Changing Whole
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Primary 6 Mathematics Learning Guide | Repeated Identity, Chained Ratios and Shared Middle Quantities
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Primary 6 Mathematics Learning Guide | Reversibility and Inverse Thinking
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Primary 6 Mathematics Learning Guide | Selecting Relevant Information and Filtering Distractors
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Primary 6 Mathematics Learning Guide | Simplifying Problems and Equivalent Structure
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Primary 6 Mathematics Learning Guide | Stack Model, Split Model and Two-Dimensional Visual Reasoning
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Primary 6 Mathematics Learning Guide | Synthesis Problems and End-to-End Solution Architecture
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Primary 6 Mathematics Learning Guide | Systematic Listing and Case Organisation
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Primary 6 Mathematics Learning Guide | Three-Quantity Comparison Models and Multi-Bar Alignment
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Primary 6 Mathematics Learning Guide | Transfer to Novel and Unfamiliar Problems
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Primary 6 Mathematics Learning Guide | Unit Overlay Strategy: Superimposing Equivalent Units and Shared Sections
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Primary 6 Mathematics Learning Guide | Working Backwards and Before–After Reasoning
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Primary 6 Mathematics Learning Hub | PSLE Mathematics Guides
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Primary 6 Mathematics Sengkang | PSLE Exam-Control Checklist
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Primary 6 Mathematics Sengkang | The Voyage of Water
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Primary 6 Mathematics Tuition Sengkang | 2026 PSLE Math & Exam Control
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Primary 6 Mathematics Tutor | Curie Series | Integration, PSLE and the Handover to Algebra
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Primary 6 PSLE Revision Timetable Template (downloadable)
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Primary 6 Science Learning Guide | Adaptation, Unfavourable Environments, Movement & Survival for PSLE
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Primary 6 Science Learning Guide | Alternative Explanations, Contradictions & Anomaly Resolution for PSLE
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Primary 6 Science Learning Guide | Analogy, Similarity & Transfer Boundaries for PSLE
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Primary 6 Science Learning Guide | Boundary Cases, Exceptions & Edge Conditions for PSLE
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Primary 6 Science Learning Guide | Cause, Mechanism, Explanation Chains & Evidence for PSLE
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Primary 6 Science Learning Guide | Claims, Evidence, Reasoning & Counterclaims for PSLE
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Primary 6 Science Learning Guide | Concepts, Systems, Interactions & Energy
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Primary 6 Science Learning Guide | Confidence, Uncertainty, Anomalies & Strength of Evidence for PSLE
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Primary 6 Science Learning Guide | Confounding Variables, Controls & Experimental Validity for PSLE
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Primary 6 Science Learning Guide | Constructing Tables, Graphs & Data Displays for PSLE
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Primary 6 Science Learning Guide | Data, Graphs, Diagrams & Evidence
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Primary 6 Science Learning Guide | Digestive System: Digestion vs Absorption, Food Path, Small Intestine, Large Intestine & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Diversity, Classification, Life Cycles & Reproduction for PSLE
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Primary 6 Science Learning Guide | Electrical Circuits: Current, Series vs Parallel, Switches, Brightness & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Electrical Systems, Circuits & Energy for PSLE
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Primary 6 Science Learning Guide | Energy Conversion: Trace Energy Through a System
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Primary 6 Science Learning Guide | Energy in Food: The Sun, Plants, Animals, Respiration & Energy Pathways for PSLE
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Primary 6 Science Learning Guide | Evidence Synthesis Across Text, Tables, Graphs & Diagrams for PSLE
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Primary 6 Science Learning Guide | Exam Timing, Question Triage, Recovery & Final Checking for PSLE
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Primary 6 Science Learning Guide | Food Chains & Food Webs: Arrow Direction, Producers, Consumers, Decomposers, Population Changes & Common PSLE Concept Traps
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Primary 6 Science Learning Guide | Forces: Friction, Gravity and Elastic Spring Force
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Primary 6 Science Learning Guide | Heat vs Temperature, Thermal Energy Transfer, State Changes & Common PSLE Concept Traps
Browse every published Post
3746 results found
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PSLE Science Data & Experiment Questions Tutor Sengkang | Variables, Evidence & Explanation
13–19 minutes -
PSLE Mathematics Problem-Solving Tutor Sengkang | Models, Heuristics & Transfer
8–13 minutes -
Primary English Composition Tutor Sengkang | Ideas, Structure & Editing
9–14 minutes -
Primary English Comprehension Tutor Sengkang | Meaning, Inference & Evidence
10–15 minutes -
PSLE Science Reality Lab Vol No.265 | “System Availability = 95%” — Is It Producing 95% of Full Power?
13–20 minutes -
PSLE Science Reality Lab Vol No.264 | “Canopy Cover = 70%” — Does That Mean 70% of the Trees Are Still There?
9–14 minutes -
PSLE Science Reality Lab Vol No.263 | “First-Pass Yield = 95%” — Does That Mean 95% of Finished Products Are Good?
9–13 minutes -
PSLE Science Reality Lab Vol No.262 | “Battery State of Health = 80%” — Is the Battery Only 80% Charged?
10–15 minutes -
PSLE Science Reality Lab Vol No.261 | “Fire Weather Index = 30” — Is There a 30% Chance of a Wildfire?
9–14 minutes -
PSLE Science Reality Lab Vol No.260 | “Species Richness = 20” — Were Only 20 Organisms Counted?
9–14 minutes -
PSLE Science Reality Lab Vol No.259 | “Land Surface Temperature = 50°C” — Is the Air Temperature 50°C?
9–13 minutes -
PSLE Science Reality Lab Vol No.258 | “Aerosol Optical Depth = 0.8” — Is That the Ground-Level PM2.5 Concentration?
11–16 minutes -
PSLE Science Reality Lab Vol No.257 | “Detected in 70% of Samples” — Was It Present 70% of the Time or Across 70% of the Area?
13–19 minutes -
PSLE Science Reality Lab Vol No.256 | “Pilot-Scale Test Removed 90%” — Will the Full-Scale System Always Remove 90%?
13–19 minutes -
PSLE Science Reality Lab Vol No.255 | “Passive Sampler Average = 5 µg/L” — Was the Water at 5 µg/L the Whole Time?
14–21 minutes -
PSLE Science Reality Lab Vol No.254 | “The Hindcast Matched the Past” — Does That Prove the Forecast Will Be Right?
10–15 minutes -
PSLE Science Reality Lab Vol No.253 | “Cycle Life = 500 Cycles” — Does the Battery Die on Cycle 501?
10–15 minutes -
PSLE Science Reality Lab Vol No.252 | “Cpk = 1.33” — Does One Number Guarantee Every Product Meets the Limits?
9–13 minutes -
PSLE Science Reality Lab Vol No.251 | “2-Hour Fire-Resistance Rating” — Will the Assembly Always Last Two Hours in a Real Fire?
9–13 minutes -
PSLE Science Reality Lab Vol No.250 | “Air Sensor Says PM2.5 = 40” — Is That the Same as a Regulatory Monitor Reading?
11–16 minutes -
PSLE Science Reality Lab Vol No.249 | “Correlation r = 0.80” — Does That Prove One Variable Causes the Other?
9–13 minutes -
PSLE Science Reality Lab Vol No.248 | “The Scale Shows 12.34 g” — Is the Mass Accurate to the Nearest 0.01 g?
7–11 minutes -
PSLE Science Reality Lab Vol No.247 | “Climate Normal = 30°C” — Is 30°C What the Weather Is Supposed to Be Every Day?
8–12 minutes -
PSLE Science Reality Lab Vol No.246 | “One Grab Sample Met the Limit” — Does That Mean the Whole River Met It All Day?
11–16 minutes -
PSLE Science Reality Lab Vol No.245 | “Satellite Soil Moisture = 0.30” — Does That Describe the Soil All the Way Down to the Roots?
16–23 minutes -
PSLE Science Reality Lab Vol No.244 | “Satellite Chlorophyll-a Is High Here” — Did the Satellite Count the Phytoplankton?
10–15 minutes -
PSLE Science Reality Lab Vol No.243 | “Species Occupancy = 70%” — Was the Species Actually Seen at 70% of the Sites?
11–16 minutes -
PSLE Science Reality Lab Vol No.242 | “Emission Factor = 2 kg per tonne” — Was 2 kg Actually Measured From This Exact Source?
11–17 minutes -
The Tutor Handbook Glossary of Terms | What the Jargon Means in Plain English
32–47 minutes -
PSLE Science Reality Lab Vol No.241 | “The Concentration Halved” — Did the River Carry Half as Much Substance?
10–15 minutes -
PSLE Science Reality Lab Vol No.240 | “Tree Rings Show It Was 2°C Cooler” — Was That Temperature Directly Measured?
12–18 minutes -
PSLE Science Reality Lab Vol No.239 | “AQL = 1.0” — Does Every Accepted Lot Have at Most 1% Defects?
12–18 minutes -
PSLE Science Reality Lab Vol No.238 | “RPD = 5%” — Does That Mean the Result Is 95% Accurate?
10–16 minutes -
PSLE Science Reality Lab Vol No.237 | “D3 Extreme Drought” on the Map — Is That One Direct Measurement or a Forecast?
10–14 minutes -
PSLE Science Reality Lab Vol No.236 | “Endangered” on the IUCN Red List — Does That Tell You Exactly How Many Animals Are Left?
9–13 minutes -
PSLE Science Reality Lab Vol No.235 | “Exoplanet Candidate” — Has a Planet Already Been Confirmed?
8–13 minutes -
PSLE Science Reality Lab Vol No.234 | “Potentially Hazardous Asteroid” — Does That Mean It Is Going to Hit Earth?
9–13 minutes -
The Tutor Handbook Vol No.0210 | The Mission-to-Practice Translation Gate — How a Tuition Programme Turns Broad Goals Into Tutor-Visible Decisions Without Replacing Professional Judgement With Slogans or Scripts
19–29 minutes -
The Tutor Handbook Vol No.0209 | The Implementation-Outcome Interpretation Gate — How a Tuition Programme Reads Fidelity, Reach, Feasibility, Acceptability and Sustainability Together Without Averaging Unlike Signals Into One Fake Success Score
19–28 minutes -
The Tutor Handbook Vol No.0208 | The Coaching–Evaluation Role Boundary — How a Tuition Programme Separates Developmental Coaching From Performance Judgement So Tutors Can Learn Honestly Without Making Accountability Disappear
19–28 minutes -
PSLE Science Reality Lab Vol No.233 | “Carbon Neutral” — Does That Mean Zero Greenhouse-Gas Emissions?
9–13 minutes -
PSLE Science Reality Lab Vol No.232 | “Population Index = 120” — Were 120 Animals Counted?
8–12 minutes -
PSLE Science Reality Lab Vol No.231 | “MTBF = 100,000 h” — Will This Device Last 100,000 Hours?
9–13 minutes -
PSLE Science Reality Lab Vol No.230 | “Germination = 90%” — Will Exactly 9 of Every 10 Seeds Grow?
10–14 minutes -
PSLE Science Reality Lab Vol No.229 | “Pasteurized” — Does That Mean the Milk Is Sterile?
9–14 minutes -
PSLE Science Reality Lab Vol No.228 | “Wildfire 80% Contained” — Does That Mean 80% of the Fire Is Out?
9–14 minutes -
PSLE Science Reality Lab Vol No.227 | “L70 = 50,000 h” — Does the LED Suddenly Die at Hour 50,000?
10–15 minutes -
PSLE Science Reality Lab Vol No.226 | “IP68” — Does That Mean the Device Is Waterproof in Any Situation?
11–17 minutes -
PSLE Science Reality Lab Vol No.225 | “High Tide = 1.8 m” — Is the Sea 1.8 m Deep?
13–19 minutes -
PSLE Science Reality Lab Vol No.224 | “Tensile Strength = 500 MPa” — Can Any Object Made From It Hold the Same Load?
9–14 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.
