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 4 Mathematics Learning Guide | Angles, Protractor Reading, Symmetry and Spatial Construction
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Primary 4 Mathematics Learning Guide | Area, Perimeter, Angles, Symmetry and Nets
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Primary 4 Mathematics Learning Guide | Assumption Method: Supposition, Excess, Difference and Word Problems
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Primary 4 Mathematics Learning Guide | Before-and-After Problems: Unknown Start, Change and Final Quantity
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Primary 4 Mathematics Learning Guide | Composite Figures, Missing Lengths and Boundary Tracing
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Primary 4 Mathematics Learning Guide | Constant Difference: Equal Changes, Comparison and the Gap That Stays the Same
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Primary 4 Mathematics Learning Guide | Constant Total: Transfers, Redistribution and the Quantity That Does Not Change
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Primary 4 Mathematics Learning Guide | Data, Word Problems, Strategy Choice and Self-Checking
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Primary 4 Mathematics Learning Guide | Decimal Measurement, Place Value and Rounding Accuracy
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Primary 4 Mathematics Learning Guide | Diagnostic Assessment, Capability Profile and Repair Routing
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Primary 4 Mathematics Learning Guide | Division, Remainders, Equal Grouping and Quotient Interpretation
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Primary 4 Mathematics Learning Guide | Equal Concept: Equal at First, Equal at End and Before–After Models
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Primary 4 Mathematics Learning Guide | Error Atlas, Misconceptions, First Weak Link and Correction
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Primary 4 Mathematics Learning Guide | Factors, Multiples, Common Factors and Common Multiples
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Primary 4 Mathematics Learning Guide | Fraction Addition, Subtraction, Common Denominators and Mixed Contexts
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Primary 4 Mathematics Learning Guide | Fraction Word Problems, Reference Wholes and Mixed Numbers
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Primary 4 Mathematics Learning Guide | Fractions, Decimals and Number Relationships
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Primary 4 Mathematics Learning Guide | Grouping Concept: Quantity × Value, Equal Sets and Regrouping
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Primary 4 Mathematics Learning Guide | Home Learning, Homework Independence and Parent Support
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Primary 4 Mathematics Learning Guide | Length: Kilometres, Metres, Centimetres and Compound Units
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Primary 4 Mathematics Learning Guide | Mass: Kilograms, Grams and Compound Units
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Primary 4 Mathematics Learning Guide | Mathematical Communication, Complete Working and Explanation
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Primary 4 Mathematics Learning Guide | Mixed Problem Laboratory, Interleaving and Transfer
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Primary 4 Mathematics Learning Guide | Mixed-Topic Problems, Representation Choice and Error Recovery
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Primary 4 Mathematics Learning Guide | Money in Decimal Notation, Change, Budgeting and Word Problems
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Primary 4 Mathematics Learning Guide | Multiple Solution Routes: Choosing, Comparing and Verifying Mathematics Strategies
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Primary 4 Mathematics Learning Guide | Multiplicative Comparison, Bar Models and Unknown Units
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Primary 4 Mathematics Learning Guide | Nets, 2D Representations and 3D Spatial Reasoning
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Primary 4 Mathematics Learning Guide | Number Sequences, Rounding, Estimation and Approximation
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Primary 4 Mathematics Learning Guide | Part-Whole, Difference and Equal-Group Models: Choosing the Correct Bar Model
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Primary 4 Mathematics Learning Guide | Patterns and Generalisation: Observe, Predict, Test and Explain
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Primary 4 Mathematics Learning Guide | Practice Paper: Arithmetic, Reasoning and Mixed Review with Worked Solutions
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Primary 4 Mathematics Learning Guide | Problem Posing, Changing Conditions and Creating Valid Questions
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Primary 4 Mathematics Learning Guide | Repeated Identity: Linked Comparisons, Shared Quantity and Model Drawing
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Primary 4 Mathematics Learning Guide | Revision Strategy: Topic Checklist, Weak-Link Repair and Assessment Readiness
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Primary 4 Mathematics Learning Guide | Shortage and Surplus: Excess, Deficit, Fixed Groups, Left Over and Short Of
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Primary 4 Mathematics Learning Guide | Simplifying Problems: Smaller Numbers, Simpler Cases and Rebuilding the Original
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Primary 4 Mathematics Learning Guide | Single Unchanged Quantity: Constant Single Subject and Before–After Reasoning
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Primary 4 Mathematics Learning Guide | Special Cases, Boundaries, Counterexamples and Impossible Cases
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Primary 4 Mathematics Learning Guide | Speed and Accuracy: Efficient Working, Pacing and Error Prevention
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Primary 4 Mathematics Learning Guide | Systematic Listing, Tables and Guess-and-Check
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Primary 4 Mathematics Learning Guide | Tables, Line Graphs, Pie Charts and Scale Reading
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Primary 4 Mathematics Learning Guide | Translating Representations: Words, Tables, Number Lines, Bar Models and Equations
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Primary 4 Mathematics Learning Guide | Unitary Method: One Unit, Fractional Part, Find the Whole and Scale Up
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Primary 4 Mathematics Learning Guide | Volume of Liquid: Litres, Millilitres and Compound Units
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Primary 4 Mathematics Learning Guide | Whole Numbers, Factors, Multiples and the Four Operations
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Primary 4 Mathematics Learning Guide | Working Backwards: Inverse Operations and Missing Quantities
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Primary 4 Mathematics Learning Hub | Number, Fractions, Geometry, Data and Problem Solving
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Primary 4 Mathematics Sengkang | The Voyage of Water
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Primary 4 Mathematics Sengkang | Upper-Primary Straddle Diagnostic
Browse every published Post
3746 results found
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How to Learn the Grunwald–Winstein Equation: From Solvent Ionising Power and Solvolysis Rates to Extended LFERs, Mechanistic Breaks and Model Limits
7–11 minutes -
How to Learn Diffusion-Controlled Reactions and the Smoluchowski Limit: From Molecular Encounters and Relative Diffusion to Reaction-Controlled Kinetics, Cage Effects and Model Limits
7–11 minutes -
How to Build Retrieval Across Diversity, Cycles, Systems, Energy and Interactions for PSLE Science
9–13 minutes -
How to Know Whether You Really Understand a PSLE Science Concept
6–9 minutes -
How to Solve PSLE Science Multiple-Choice Questions Without Guessing From Familiar Words
7–10 minutes -
How to Answer State, Describe, Explain, Compare and Predict Questions in PSLE Science
8–11 minutes -
How to Learn the Stern–Volmer Equation and Fluorescence Quenching: From Excited-State Collisions to Static Complexes, Lifetime Tests and Reliable Chemical Measurement
7–11 minutes -
How to Learn the Nephelauxetic Effect: From Racah Parameters and d-Electron Repulsion to Metal–Ligand Covalency, Spectral Shifts and Model Limits
8–11 minutes -
How to Learn the Thorpe–Ingold Effect: From Geminal Substitution and Conformational Bias to Effective Molarity, Cyclisation Rates and Mechanistic Limits
7–11 minutes -
How to Learn the Brønsted–Bjerrum Primary Kinetic Salt Effect: From Ionic Strength and Activities to Charge-Signed Rate Changes and Mechanistic Limits
9–13 minutes -
How to Manage PSLE Science Time Without Rushing the Reasoning
7–10 minutes -
How to Recognise the Same PSLE Science Concept When the Surface Example Changes
7–10 minutes -
How to Evaluate a PSLE Science Experiment and Improve the Method
7–11 minutes -
How to Learn PSLE Science Interactions by Tracking What Affects What and Under Which Conditions
8–12 minutes -
How to Learn ICP–OES: From Argon Plasma Atomisation and Excitation to Element-Specific Emission Lines, Calibration, Interferences and Measurement Uncertainty
9–14 minutes -
How to Learn Defect Chemistry in Ionic Solids: From Schottky and Frenkel Defects to Kröger–Vink Notation, Oxygen Vacancies, Non-Stoichiometry and Ionic Conductivity
8–12 minutes -
How to Learn the Mayr–Patz Reactivity Equation: From Nucleophilicity and Electrophilicity Parameters to Rate Prediction, Selectivity and Mechanistic Limits
7–11 minutes -
How to Learn the Gibbs–Duhem Equation and Partial Molar Quantities: From Chemical Potential and Composition Constraints to Activity Coefficients, Phase Equilibria and Thermodynamic Consistency
7–11 minutes -
How to Learn Bjerrum Speciation Diagrams and Conditional Formation Constants: From pKa and Fractional Composition to Metal–Ligand Binding, Side Reactions and Chemical Measurement
8–12 minutes -
How to Learn Latimer and Frost Diagrams: From Standard Reduction Potentials and Oxidation States to Disproportionation, Comproportionation and Redox Stability
8–12 minutes -
How to Learn the Hammond Postulate: From Reaction Coordinates and Relative Energies to Early/Late Transition States, Selectivity and Model Limits
8–12 minutes -
How to Learn Fugacity and Real-Gas Chemical Potential: From Ideal-Gas Pressure to Fugacity Coefficients, Phase Equilibrium and Non-Ideal Thermodynamics
7–10 minutes -
How to Learn the Zimmerman–Traxler Model: From Enolate Geometry and Chair-Like Aldol Transition States to syn/anti Stereochemistry and Model Limits
9–14 minutes -
How to Learn Flory–Huggins Solution Theory: From Polymer Mixing Entropy and the χ Parameter to Binodals, Spinodals, Criticality and Phase Separation
9–14 minutes -
How to Learn Karl Fischer Water Determination: From Iodine–Sulfur Dioxide Stoichiometry to Volumetric Titration, Coulometry, Interferences and Trace-Water Evidence
9–14 minutes -
How to Learn Spin-Crossover Chemistry: From Ligand-Field Splitting and Pairing Energy to High-Spin/Low-Spin Equilibria, Cooperativity, Hysteresis and Molecular Switching
9–14 minutes -
How to Learn the Felkin–Anh Model: From Bürgi–Dunitz Carbonyl Attack to Stereoelectronic Control, Polar Effects, Chelation and Diastereoselectivity
8–13 minutes -
How to Learn Kirkwood–Buff Solution Theory: From Pair Correlations and Excess Coordination to Activity Coefficients, Preferential Solvation and Molecular Simulation
9–14 minutes -
How to Learn Isotope Dilution Mass Spectrometry: From Enriched Spikes and Isotope Ratios to Mass Bias, Traceability, Uncertainty and Metrological Accuracy
9–13 minutes -
How to Learn the Dewar–Chatt–Duncanson Model: From Alkene π Donation and Metal Backbonding to Bond Activation, Spectroscopic Evidence and Organometallic Reactivity
8–11 minutes -
How to Learn Baldwin’s Rules for Ring Closure: From exo/endo and tet/trig/dig Geometry to Stereoelectronic Trajectories, Exceptions and Mechanistic Use
7–11 minutes -
How to Learn Kramers Theory and Solvent Friction: From Barrier Crossing and Langevin Motion to Turnover, Recrossing and Condensed-Phase Reaction Rates
10–14 minutes -
How to Learn PSLE Science Energy by Tracking Sources, Transfers and Effects
7–11 minutes -
How to Learn PSLE Science Systems by Following Parts, Functions and Interactions
7–10 minutes -
How to Learn PSLE Science Cycles by Tracking What Changes and What Returns
7–11 minutes -
How to Learn PSLE Science Diversity Through Classification, Evidence and Relationships
7–10 minutes -
How to Learn Ion-Selective Electrodes and Potentiometry: From Membrane Selectivity and Ion Activity to Nernst Slopes, Interferences and Reliable Calibration
9–14 minutes -
How to Learn the Chelate and Macrocyclic Effects: From Denticity and Formation Constants to Solvation, Preorganisation, Entropy and Metal-Ion Selectivity
8–11 minutes -
How to Learn Kinetic Isotope Effects: From Zero-Point Energy and kH/kD to Transition-State Structure, Tunnelling and Mechanistic Limits
7–11 minutes -
How to Learn the Lindemann–Hinshelwood Mechanism and Falloff Kinetics: From Collision Activation to Pressure-Dependent Unimolecular Rates, RRKM and Master Equations
7–11 minutes -
How to Learn the Rotating Disk Electrode and Koutecký–Levich Analysis: From Controlled Mass Transport to Kinetics, Diffusion and Electrochemical Mechanism
8–12 minutes -
How to Learn Tanabe–Sugano Diagrams: From d-Electron Terms and Racah Parameters to Ligand-Field Strength, Spin States and Electronic Spectra
8–12 minutes -
How to Learn Oxidative Addition and Reductive Elimination: From Metal Electron Counts to Bond Activation, Catalytic Cycles and Mechanistic Alternatives
8–12 minutes -
How to Learn the Hammett Equation and Linear Free-Energy Relationships: From Substituent Constants to Reaction Constants, Mechanistic Breaks and Physical-Organic Reasoning
8–12 minutes -
How to Turn PSLE Science Diagrams, Tables and Graphs Into Evidence for an Answer
13–20 minutes -
How to Answer PSLE Science Prediction and Hypothesis Questions
11–17 minutes -
How to Decode Variables and Fair Tests in PSLE Science Questions
12–18 minutes -
How to Read a PSLE Science Question Before You Answer
15–22 minutes -
How to Learn the Standard Addition Method: From Matrix Effects and Calibration Slopes to Extrapolation, Uncertainty and Reliable Quantitative Analysis
9–13 minutes -
How to Learn the Jahn–Teller Effect: From Electronic Degeneracy and Vibronic Coupling to Distorted Coordination Geometry, Spectra and Materials Behaviour
6–10 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.
