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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The Complete Sengkang Guide (2026): Food, Things to Do, Schools, Transport, Housing and What’s Next
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The Contrast Test | Marie Curie Series | Can the Learner Tell Similar Ideas Apart?
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The Darwin Series | Why Learning Has to Evolve
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The Discriminating Test | Marie Curie Series | Which Small Test Separates Competing Explanations?
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The Evidence Loop | Marie Curie Series | How We Know Learning Changed
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The Examination-Ready Learner: What Still Goes Wrong on the Day
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The Forward–Reverse Test | Marie Curie Series | Can the Learner Reason Both Ways Without Assuming Both Directions Are Equivalent?
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The Fragile Learner: Right Today, Wrong Tomorrow
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The Generalisation Test | Marie Curie Series | Can the Learner Extend an Idea Without Overextending It?
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The Goal of Tuition | Building a Learner Who Needs Less Help Over Time
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The Independent Start | Marie Curie Series | What Happens Before the First Prompt
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The Last Two Weeks Before PSLE: A Day-by-Day Plan
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The Last Two Weeks Before SEC: A Day-by-Day Plan
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The Launch Window | Readiness Depends on Capability and Conditions
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The Marie Curie Series | Making Invisible Learning Visible
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The Measurement Effect | Marie Curie Series | When Testing Changes What We Are Trying to See
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The Mistake Log That Actually Reduces Repeats
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The Pressure Test | Marie Curie Series | What Changes When Time, Stakes and Interference Rise
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The Reference Condition | Marie Curie Series | What Are We Comparing This Learning Result Against?
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The Repeatability Test | Marie Curie Series | Does the Capability Reappear Under Equivalent Conditions?
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The Resolution Limit | Marie Curie Series | How Fine a Learning Difference Can Our Evidence Actually See?
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The Robustness Test | Marie Curie Series | Does the Capability Survive Harmless Variation?
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The Sampling Window | Marie Curie Series | Have We Seen Enough of the Capability to Generalise?
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The School Says ‘Good Effort’ but the Marks Say Otherwise
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The Spaceport | Why the Learning Environment Is Part of the System
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The Stable Learner: Reliable on the Familiar, Stuck on the New
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The Stopping Rule | Marie Curie Series | When Do We Know Enough to Act Without Testing Forever?
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The Transfer Test | Marie Curie Series | What Happens When the Question Changes Shape
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The Transfer-Ready Learner: When to Change the Conditions
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The Tutor Handbook
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The Tutor System | How Parents, Students and Tutors Work Together
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The Voyage of Water | English, Mathematics & Science from Primary 1 to Secondary 4
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The Voyage Series | English, Mathematics and Science Connections
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Time Budget for PSLE English: Paper by Paper, Minute by Minute
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Time Budget for PSLE Maths: Paper 1 and Paper 2
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Time Budget for PSLE Science: Booklet A and Booklet B
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Time Budget for SEC English: G1, G2 and G3 Papers
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Tower Clear | The Moment Control Begins to Transfer
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Tuition Enquiry Process in Sengkang | What Happens Next After You Contact eduKate
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Tuition in Sengkang: What Is Near Compass One, Sengkang MRT and Buangkok, and How to Compare It
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Tutor | The Marie Curie Series | The Student Learning Dashboard
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Tutorial | The Marie Curie Series | The Learning Room Where Evidence Appears
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Umbilicals | The Supports That Must Eventually Disconnect
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University English Tutor | Curie Series | Academic Reading, Writing and Disciplinary Independence
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University Mathematics Tutor | Curie Series | Proof, Modelling and Disciplinary Independence
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University Science Tutor | Curie Series | Evidence, Literature, Method and Scientific Self-Correction
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University, Research & Professional Science | From Literature to Scientific Judgement
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Veterinary Science | Animal Health, Evidence, Welfare and One Health
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Voyage Series
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Watchtower Agent | Estate Drift and Change Observer
Browse every published Post
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How to Learn X-Ray Absorption Spectroscopy (XAS): From Absorption Edges and XANES to EXAFS, Operando Local Structure and Machine-Assisted Spectral Inference
5–7 minutes -
How to Learn Levenberg–Marquardt: Nonlinear Least Squares, Gauss–Newton, Damping, Trust Regions and Robust Curve Fitting
7–10 minutes -
How to Learn Raymond’s Tree-Based Mutual Exclusion: Tokens, Holder Pointers, Request Queues, Tree Reorientation and Message Complexity
8–11 minutes -
How to Learn Neighbor-Joining: Distance Matrices, Q-Criteria, Limb Lengths, Unrooted Trees and Phylogenetic Reconstruction
7–10 minutes -
How to Learn the Nussinov Algorithm: RNA Secondary Structure, Interval Dynamic Programming, Base-Pair Recurrences and Backtracking
6–9 minutes -
How to Learn Bridson’s Poisson-Disk Sampling: Blue Noise, Minimum-Distance Grids, Active Lists and Fast Spatial Sampling
6–9 minutes -
How to Learn the Fast Marching Method: Eikonal Equations, Accepted Fronts, Upwind Updates and Arrival-Time Computation
5–8 minutes -
How to Learn Gale–Shapley Deferred Acceptance: Stable Matching, Preference Lists, Proposer Optimality and Market-Design Reasoning
5–8 minutes -
Hirschberg’s Algorithm | Linear-Space LCS Learning Guide
5–8 minutes -
How to Learn Suurballe’s Algorithm: Reweighting, Residual Graphs, Edge-Disjoint Shortest Paths and Resilient Routing
5–8 minutes -
How to Learn the Frank–Wolfe Algorithm: Linear Minimization Oracles, Duality Gaps, Projection-Free Optimization and Sparse Iterates
6–8 minutes -
How to Learn the Package-Merge Algorithm: Length-Limited Huffman Coding, Coin-Collector Reduction, Code-Length Bounds and Production Compression
6–9 minutes -
Boyer–Myrvold Planarity Testing | Graph Algorithms Learning Guide
6–9 minutes -
How to Learn ADMM: Variable Splitting, Augmented Lagrangians, Primal/Dual Residuals and Distributed Convex Optimization
5–7 minutes -
How to Learn FISTA: Proximal Operators, Momentum, Shrinkage, O(1/k²) Convergence and Restarted Sparse Optimization
5–8 minutes -
How to Learn the Leiden Algorithm: Local Moving, Refinement, Aggregation, CPM/Modularity and Well-Connected Communities
5–8 minutes -
How to Learn the Lanczos Algorithm: Krylov Subspaces, Three-Term Recurrence, Ritz Values, Reorthogonalization and Sparse Eigenproblems
5–8 minutes -
How to Learn Reverse Cuthill–McKee: Sparse Matrix Reordering, Bandwidth Reduction, Pseudo-Peripheral Vertices and Solver Locality
5–8 minutes -
How to Learn Welzl’s Algorithm: Smallest Enclosing Circles, Support Sets, Randomized Incremental Geometry and Expected Linear Time
5–7 minutes -
How to Learn the Fast Marching Method: Eikonal Equations, Accepted Fronts, Upwind Updates and O(N log N) Arrival-Time Computation
5–8 minutes -
How to Learn Sequential Minimal Optimization (SMO): SVM Dual Variables, KKT Conditions, Working Sets and Kernel Training
6–9 minutes -
Amanatides–Woo Voxel Traversal | 3D DDA Learning Guide
7–11 minutes -
How to Learn Bridson’s Poisson-Disk Sampling: Active Lists, Background Grids, Blue Noise and O(N) Spatial Sampling
7–11 minutes -
How to Learn Fisher–Yates Shuffle: Uniform Permutations, Swap Invariants, Modulo Bias and Production-Grade Randomness
7–10 minutes -
How to Learn the Goertzel Algorithm: Single-Bin DFTs, Second-Order Recurrences, Tone Detection and Numerical Stability
7–10 minutes -
How to Learn Bacterial Chemotaxis and Chemoreceptor Arrays: From Molecular Sensing to Run–Tumble Navigation and Adaptive Memory
8–13 minutes -
How to Learn Comammox Nitrospira and Complete Nitrification: From a Two-Microbe Textbook Pathway to One-Cell Ammonia-to-Nitrate Metabolism
9–13 minutes -
How to Learn Polyhydroxyalkanoates (PHA/PHB) and Bacterial Carbon-Storage Granules: From Excess Carbon to Carbonosomes and Bioplastics
8–12 minutes -
How to Learn Archaeal S-Layers and Cell-Surface Glycoproteins: From Protein Lattices to Extreme Cell Envelopes
7–10 minutes -
How to Learn Glass Science and Amorphous Materials: From Supercooled Liquids to Glass Transition, Metallic Glasses and Structural Relaxation
8–12 minutes -
How to Learn Cosmic Rays and Particle Astrophysics: From Charged Particles to Air Showers, PeVatrons and Multimessenger Astronomy
7–11 minutes -
How to Learn Fruchterman–Reingold: Attractive and Repulsive Forces, Cooling, Equilibrium and Production Graph Layout
5–8 minutes -
How to Learn Sinkhorn–Knopp: Matrix Scaling, Doubly Stochastic Matrices, Convergence and Entropic Optimal Transport
5–8 minutes -
How to Learn Barnes–Hut: Quadtrees, Octrees, Opening Angles, Force Approximation and O(N log N) N-Body Simulation
5–8 minutes -
How to Learn Jump Point Search: Grid Symmetry Pruning, Forced Neighbours, Jump Points and Optimal A* Acceleration
6–9 minutes -
How to Learn Immunometabolism and Immune Cell Metabolism: From Glycolysis and Mitochondria to Metabolic Reprogramming and Immune Function
8–11 minutes -
How to Learn Aeolian Geomorphology and Desert Dunes: From Saltation to Dune Fields, Dust and Planetary Landscapes
8–11 minutes -
How to Learn Rollback DSU: Reversible Union-Find, Offline Dynamic Connectivity and Time-Segment Recursion
3–5 minutes -
How to Learn MinHash: Jaccard Similarity, Random Permutations, Signatures and Locality-Sensitive Hashing
3–4 minutes -
How to Learn Heavy-Hitter Algorithms: Misra–Gries, Space-Saving, Error Bounds and Streaming Frequency
3–5 minutes -
How to Learn Cuckoo and Quotient Filters: Fingerprints, Relocation, Deletion and Approximate Membership
3–5 minutes -
How to Learn Inductively Coupled Plasma Mass Spectrometry (ICP-MS): From Plasma Ionisation and Mass-to-Charge Separation to Trace Elements, Isotope Ratios and Single-Particle/Single-Cell Analysis
9–13 minutes -
How to Learn SQUID Magnetometry and Vibrating Sample Magnetometry (VSM): From Magnetic Moment and Hysteresis to Susceptibility, Superparamagnetism and Scanning SQUID Microscopy
8–12 minutes -
How to Learn X-Ray Fluorescence (XRF): From Characteristic X-Rays and Matrix Effects to Quantitative Elemental Analysis, Micro-XRF and Autonomous Chemical Mapping
7–11 minutes -
How to Learn Atom Probe Tomography (APT): From Field Evaporation and Time-of-Flight Mass Spectrometry to 3D Atomic Chemistry, Cryo-APT and Correlative Nanometrology
9–13 minutes -
How to Learn Electron Probe Microanalysis (EPMA/WDS): From Electron-Beam X-Rays and Standards to Quantitative Element Maps, Trace Analysis and Planetary Materials
7–10 minutes -
How to Learn Isothermal Titration Calorimetry (ITC): From Heat Pulses and Binding Isotherms to Affinity, Stoichiometry, Thermodynamics and Kinetic Mechanism
6–9 minutes -
How to Learn Acoustic Emission Testing and Structural Health Monitoring: From Elastic-Wave Bursts to Crack Localization, Damage Mechanics and Machine-Learned Diagnostics
6–9 minutes -
How to Learn Electrochemical Impedance Spectroscopy (EIS): From AC Perturbations and Nyquist Plots to Charge Transfer, Diffusion, DRT and Battery Diagnostics
6–9 minutes -
How to Learn Bacteriophages and Phage–Bacteria Ecology: From Adsorption and Lysis to Lysogeny, Defence Systems and Viral Ecology
10–15 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.
