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 4 Science Learning Guide | Mixed Concepts and Integrated Reasoning
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Primary 4 Science Learning Guide | Mixed Practice Workshop with Worked Answers
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Primary 4 Science Learning Guide | Multi-Step Problem Solving
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Primary 4 Science Learning Guide | No Change, Null Results and What You Can Conclude
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Primary 4 Science Learning Guide | Observation, Inference, Conclusion and Evidence
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Primary 4 Science Learning Guide | Observer Expectations, Confirmation Bias and Independent Checks
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Primary 4 Science Learning Guide | Open-Ended Answer Construction
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Primary 4 Science Learning Guide | Oral Explanation, Teach-Back and Questioning
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Primary 4 Science Learning Guide | Order Effects, Carryover and Resetting Between Trials
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Primary 4 Science Learning Guide | Pattern Recognition, Trends and Relationships
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Primary 4 Science Learning Guide | Photographs, Video and Time-Lapse Observation
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Primary 4 Science Learning Guide | Physical Model-Making, Testing and Revision
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Primary 4 Science Learning Guide | Plant and Digestive Systems Misconception Clinic
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Primary 4 Science Learning Guide | Plant and Human Systems
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Primary 4 Science Learning Guide | Plant Parts, Functions and Whole-Plant Reasoning
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Primary 4 Science Learning Guide | Practical Tests and Performance Tasks Under Real Conditions
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Primary 4 Science Learning Guide | Prediction, What-If Reasoning and Transfer
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Primary 4 Science Learning Guide | Procedure Writing and Investigation Design
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Primary 4 Science Learning Guide | Question Reading, Command Words and Answer Precision
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Primary 4 Science Learning Guide | Rate of Change, Change Per Unit Time and Fair Time Comparisons
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Primary 4 Science Learning Guide | Raw Data, Derived Values and the Evidence Trail
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Primary 4 Science Learning Guide | Reasonableness, Estimation and Sanity Checks
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Primary 4 Science Learning Guide | Relationships, Evidence and Explanation
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Primary 4 Science Learning Guide | Repeated Trials, Reliability and Consistency
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Primary 4 Science Learning Guide | Replication, Reproducibility and Independent Group Checks
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Primary 4 Science Learning Guide | Researching with Books, Websites and Secondary Sources
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Primary 4 Science Learning Guide | Safe Mini-Investigations at Home
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Primary 4 Science Learning Guide | Same Specimen Before–After vs Different Similar Specimens
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Primary 4 Science Learning Guide | Sampling, Representative Cases and Avoiding Cherry-Picking
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Primary 4 Science Learning Guide | Science Journals and Observation Logs
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Primary 4 Science Learning Guide | Science Learning Trails and Field Observation
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Primary 4 Science Learning Guide | Science Portfolios, Evidence of Growth and Reflection
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Primary 4 Science Learning Guide | Science Project Planning, Evidence and Presentation
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Primary 4 Science Learning Guide | Science Reading Comprehension and Dense Question Stems
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Primary 4 Science Learning Guide | Scientific Communication and Presenting Findings
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Primary 4 Science Learning Guide | Scientific Diagrams, Labels, Arrows and Annotation
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Primary 4 Science Learning Guide | Scientific Models and Their Limits
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Primary 4 Science Learning Guide | Scientific Vocabulary, Precision and Language
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Primary 4 Science Learning Guide | Seeking Clarification, Resolving Ambiguity and Asking the Next Useful Question
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Primary 4 Science Learning Guide | Self-Assessment, Rubrics and Success Criteria
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Primary 4 Science Learning Guide | Self-Explanation and Metacognitive Checking
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Primary 4 Science Learning Guide | Simulations and Virtual Investigations
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Primary 4 Science Learning Guide | Small Differences, Scale Intervals and Honest Precision
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Primary 4 Science Learning Guide | Testable Questions, Hypotheses and Scientific Curiosity
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Primary 4 Science Learning Guide | Treatment Duration, Observation Time and Measurement Intervals
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Primary 4 Science Learning Hub | Relationships, Systems, Matter, Light, Heat & Evidence
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Primary 4 Science Readiness | The Capability Floors Needed Before P5
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Primary 4 Science Sengkang | Relationships & Evidence Diagnostic
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Primary 4 Science Sengkang | The Voyage of Water
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Primary 4 Science Tuition at Punggol | Building Strong Foundations with eduKate
Browse every published Post
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How to Learn Critical Phenomena and Physical Phase Transitions: From Order Parameters to Scaling and Universality
10–14 minutes -
How to Learn Batteries and Electrochemistry: From Redox Reactions to Lithium-Ion Interfaces and Battery Degradation
7–11 minutes -
How to Learn Phase Transitions, Nucleation and Crystallisation: From Metastability to Crystal Growth and Transformation Kinetics
6–9 minutes -
How to Learn Radiometric Dating and Geochronology: From Half-Life to Earth’s Deep Time
9–14 minutes -
How to Learn Pain and Nociception: From Tissue Damage Signals to Spinal Gating and Conscious Experience
6–9 minutes -
How to Learn the Vestibular System, Balance and Spatial Orientation: From Inner-Ear Motion Sensors to Multisensory State Estimation
7–11 minutes -
How to Learn Sleep Architecture and Circadian Neurobiology: From Sleep Stages to Professional Chronobiology
9–13 minutes -
How to Learn Reservoir Sampling: One-Pass Random Selection, Unknown Stream Length and Uniform Guarantees
3–5 minutes -
How to Learn Simulated Annealing: Temperature, Acceptance Probability, Cooling Schedules and Search Trade-Offs
3–4 minutes -
How to Learn Ocean Waves, Tsunamis and Coastal Erosion: From Wave Motion to Shoreline Change and Hazard Forecasting
8–12 minutes -
How to Learn Skip Lists: Probabilistic Levels, Search Paths, Expected Cost and Concurrent Design
2–4 minutes -
How to Learn Splay Trees: Self-Adjustment, Rotations, Amortized Analysis and Access Locality
3–5 minutes -
How to Learn Earth’s Internal Heat, Mantle Convection and Geothermal Systems: From Planetary Cooling to Geothermal Energy
7–10 minutes -
How to Learn Aerodynamics and Flight: From Lift and Drag to Stalls, Shock Waves and Flight Testing
7–10 minutes -
How to Learn Cell Organelles, Protein Trafficking and Vesicular Transport: From Compartments to Cellular Logistics
6–9 minutes -
How to Learn Ocean Chemistry, Salinity and Marine Biogeochemistry: From Seawater Ions to Oxygen and Nutrient Cycles
7–11 minutes -
How to Learn Combustion and Flame Science: From Ignition Chemistry to Turbulent Flames
8–12 minutes -
How to Learn Surface Tension, Capillarity and Wetting: From Water Droplets to Microfluidics
6–10 minutes -
How to Learn Epigenetics and Chromatin Regulation: From DNA Packaging to Cell-State Memory
7–10 minutes -
How to Learn Polymer Chemistry and Soft Matter: From Monomers to Networks, Viscoelasticity and Circular Plastics
7–11 minutes -
How to Learn Superconductivity and Quantum Materials: From Zero Resistance to Cooper Pairing and Vortices
7–11 minutes -
How to Learn Catalysis and Reaction Mechanisms: From Activation Energy to Dynamic Active Sites
7–10 minutes -
How to Learn Electrostatics, Capacitance and Dielectrics: From Charge to Field Energy and Nanoscale Devices
6–9 minutes -
How to Learn Asteroids, Meteorites and Planetary Defense: From Space Rocks to Impact Risk and Deflection
8–12 minutes -
How to Learn Cloud Microphysics and Precipitation: From Aerosol Seeds to Rain, Snow and Hail
8–11 minutes -
How to Learn Mass Spectrometry and Molecular Identification: From m/z Peaks to Proteomics and Spatial Chemistry
8–11 minutes -
How to Learn Cell Adhesion, Extracellular Matrix and Mechanobiology: From Integrins to Tissue Mechanics
7–10 minutes -
How to Learn Colloids, Suspensions and Nanoparticles: From Brownian Motion to Self-Assembly and Nanomedicine
8–12 minutes -
How to Learn Lasers and Photonics: From Stimulated Emission to Optical Cavities, Frequency Combs and Integrated Light
7–11 minutes -
How to Learn the Cytoskeleton and Molecular Motors: From Actin and Microtubules to Intracellular Force
7–10 minutes -
How to Learn Apoptosis and Regulated Cell Death: From Caspases to Ferroptosis and Cellular Stress Decisions
7–11 minutes -
How to Learn Touch, Proprioception and Somatosensation: From Mechanoreceptors to Body Maps and Haptic Technology
8–13 minutes -
How to Learn NMR and MRI: From Nuclear Spin to Molecular Structure and Medical Imaging
7–10 minutes -
How to Learn Tribology, Friction and Lubrication: From Surface Contact to Superlubricity and Biotribology
6–9 minutes -
How to Learn Network Routing Algorithms: Distance Vector, Link State, Path Vector, ECMP and Segment Routing
10–14 minutes -
How to Learn Synchronization and Lock Algorithms: Test-and-Set, Ticket Locks, MCS Queues, Mutexes and Futexes
9–13 minutes -
How to Learn All-Pairs Shortest-Path Algorithms: Floyd–Warshall, Johnson, Reweighting and Dense–Sparse Trade-Offs
8–12 minutes -
How to Learn Multi-Pattern String Matching: Aho–Corasick, Tries, Failure Links and Streaming Search
9–13 minutes -
How to Learn Glycobiology and Glycosylation: From Sugars to Cell Recognition and Glycomics
6–8 minutes -
How to Learn Earth Observation and Remote Sensing: From Spectral Signals to Radar, Thermal Imaging and Planetary Change
6–9 minutes -
How to Learn Geodesy, GNSS and Earth Reference Frames: From Coordinates to Millimetre-Scale Measurement of a Moving Earth
11–17 minutes -
How to Learn Bioelectricity, Membrane Potentials and Ion Channels: From Electrochemical Gradients to Action Potentials and Cellular Signalling
7–10 minutes -
How to Learn CRISPR and Genome Editing: From Bacterial Immunity to Base, Prime and Clinical Editing
10–15 minutes -
How to Learn Evolutionary Algorithms: Fitness, Selection, Crossover, Mutation, Differential Evolution and Pareto Search
8–12 minutes -
How to Learn Bayesian-Optimization Algorithms: Surrogate Models, Gaussian Processes, Acquisition Functions and Sample-Efficient Search
8–13 minutes -
How to Learn Recommender-System Algorithms: Collaborative Filtering, Matrix Factorization, Retrieval, Ranking and Evaluation
8–12 minutes -
How to Learn Reinforcement-Learning Algorithms: Bellman Equations, Value Iteration, Q-Learning, Policy Gradients and Actor–Critic
9–13 minutes -
How to Learn Graph-Isomorphism Algorithms: Invariants, Color Refinement, VF2++, Individualization and Canonical Forms
8–12 minutes -
How to Learn Hidden Markov Model Algorithms: Forward Probabilities, Viterbi Decoding, Forward–Backward and Baum–Welch
8–12 minutes -
How to Learn Numerical Integration Algorithms: Trapezoids, Simpson’s Rule, Gaussian Quadrature and Adaptive Error Control
8–12 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.
