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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Secondary 4 Mathematics Learning Guide | Completing the Square, Quadratic Formula and Graphical Solutions
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Secondary 4 Mathematics Learning Guide | Congruence, Similarity, Scale Drawings and Area-Volume Ratios
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Secondary 4 Mathematics Learning Guide | Coordinate Geometry and Transformations as Representation
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Secondary 4 Mathematics Learning Guide | Coordinate Geometry: Segment Length, Straight-Line Equations and Geometric Problem Solving
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Secondary 4 Mathematics Learning Guide | Cumulative Frequency, Box Plots and Standard Deviation
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Secondary 4 Mathematics Learning Guide | Data Collection, Classification, Tabulation and Choosing Statistical Representations
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Secondary 4 Mathematics Learning Guide | Dimensional Reasoning: Units, Compound Units, Scale, Area–Volume Conversion and Error Detection
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Secondary 4 Mathematics Learning Guide | Direct and Inverse Proportion, Scale and Rate Models
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Secondary 4 Mathematics Learning Guide | Distance-Time and Speed-Time Graphs: Motion, Rate and Interpretation
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Secondary 4 Mathematics Learning Guide | Error Analysis, Corrections and Full-Paper Recovery
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Secondary 4 Mathematics Learning Guide | Formulae Provided, Working Required: Formula-Sheet Intelligence, Essential Working, Accuracy and Calculator Control
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Secondary 4 Mathematics Learning Guide | Fractional Equations Reduced to Linear and Quadratic Equations
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Secondary 4 Mathematics Learning Guide | Fractional Indices, Roots and Exact Powers
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Secondary 4 Mathematics Learning Guide | Geometrical Constructions, Bisectors and Constraint Diagrams
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Secondary 4 Mathematics Learning Guide | Geometry, Trigonometry and Measurement as a Constraint System
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Secondary 4 Mathematics Learning Guide | Gradient of Curves: Tangents, Local Rate of Change and Graphical Estimation
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Secondary 4 Mathematics Learning Guide | Grouped Data: Mean, Standard Deviation, Quartiles, Percentiles and Comparing Distributions
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Secondary 4 Mathematics Learning Guide | Histograms, Statistical Diagrams and Misleading Data
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Secondary 4 Mathematics Learning Guide | Indices, Standard Form and Exact Number Structure
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Secondary 4 Mathematics Learning Guide | Linear Graphs, Gradient, Intercepts and Rate of Change
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Secondary 4 Mathematics Learning Guide | Linear Inequalities, Number Lines and Boundary Reasoning
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Secondary 4 Mathematics Learning Guide | Mathematical Notation as an Operational Language: Equality, Approximation, Proportion, Inequalities, Sets and Vectors
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Secondary 4 Mathematics Learning Guide | Matrices, Data and Matrix Operations
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Secondary 4 Mathematics Learning Guide | Mean, Median, Mode, Range and Comparing Data Sets
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Secondary 4 Mathematics Learning Guide | Mensuration, Radians and Composite Solids
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Secondary 4 Mathematics Learning Guide | Past-Paper Forensics: Question Archetypes, First Failure, Error Ledgers and Transfer Retests
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Secondary 4 Mathematics Learning Guide | Personal and Household Finance: Interest, Taxation, Instalments, Utilities and Money Exchange
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Secondary 4 Mathematics Learning Guide | Power, Reciprocal and Exponential Graphs
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Secondary 4 Mathematics Learning Guide | Prime Factors, HCF, LCM and Divisibility Structure
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Secondary 4 Mathematics Learning Guide | Probability Event Logic: When to Add, Multiply, Subtract from One or Change the Denominator
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Secondary 4 Mathematics Learning Guide | Probability, Combined Events and Tree Diagrams
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Secondary 4 Mathematics Learning Guide | Pythagoras, Right-Triangle Trigonometry and Three-Dimensional Reasoning
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Secondary 4 Mathematics Learning Guide | Quadratic Equations and Algebraic Fractions
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Secondary 4 Mathematics Learning Guide | Quadratic Functions: Forms, Roots, Turning Points and Symmetry
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Secondary 4 Mathematics Learning Guide | Ratio, Percentage, Rates and Financial Mathematics
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Secondary 4 Mathematics Learning Guide | Real-World Geometry: Floor Plans, Surveying, Navigation and Interpretation
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Secondary 4 Mathematics Learning Guide | Reverse Percentages, Percentage Comparison and Repeated Change
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Secondary 4 Mathematics Learning Guide | Set Language, Venn Diagrams and Counting
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Secondary 4 Mathematics Learning Guide | Simultaneous Linear Equations, Intersections and Modelling
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Secondary 4 Mathematics Learning Guide | Statistics, Probability and Real-World Problems Under Exam Conditions
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Secondary 4 Mathematics Learning Guide | The Final Paper 2 Real-World Scenario: Model, Solve, Verify and Communicate
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Secondary 4 Mathematics Learning Guide | Vectors as Representation: Directed Segments, Position Vectors, Magnitude, Scalar Multiples and Translation
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Secondary 4 Mathematics Learning Guide | Vectors, Ratios and Collinearity
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Secondary 4 Mathematics Punggol | GCE 2026 to SEC 2027 Legacy Entry
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Secondary 4 Mathematics Sengkang | GCE 2026 or SEC 2027? Know Your Cohort
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Secondary 4 Mathematics Sengkang | GCE 2026 to SEC 2027 Transition
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Secondary 4 Mathematics Sengkang | The Voyage of Water
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Secondary 4 Mathematics Tuition Sengkang | SEC 2027+ Exam Preparation
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Secondary 4 Mathematics Tutor | Curie Series | Integration, SEC and the Handover Beyond Secondary School
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Secondary 4 Science Tutor | Curie Series | SEC Integration, Evidence and the Handover Beyond Secondary School
Browse every published Post
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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.
