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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How to Learn Basic English (Chinese Edition) | Start Here | 零基础英语入门
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.001 | Start With the Most Useful Words | 先学最有用的单词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.002 | Learn Meaning, Sound and Spelling Together | 意思、发音和拼写一起学
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.003 | Learn Words in Phrases, Not Alone | 单词要放进短语和句子里
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.004 | Remember Words With Retrieval and Spaced Review | 用回忆和间隔复习记住单词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.005 | People and Family Words | 人与家庭英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.006 | Home and Everyday Objects | 家与日常物品英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.007 | Food and Drink | 食物与饮料英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.008 | Core Action Verbs | 核心动作动词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.009 | Basic Adjectives and Opposites | 基础形容词与反义词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.010 | Numbers, Time and Days | 数字、时间与星期
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.011 | Question Words | 英语疑问词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.012 | Places and Transport | 地点与交通英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.013 | Body and Health Words | 身体与健康英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.014 | School and Work Words | 学习与工作英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.015 | Common Verb Phrases | 常用动词短语
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.016 | Word Families for Beginners | 初级词族
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.017 | Clothes and Colours | 衣服与颜色英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.018 | Weather and Seasons | 天气与季节英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.019 | Shopping and Money | 购物与金钱英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.020 | Technology and Communication | 科技与通讯英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.021 | Hobbies and Free Time | 兴趣爱好与休闲英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.022 | Nature and Outdoors | 自然与户外英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.023 | Everyday Polite Words | 日常礼貌英语词汇与短语
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.024 | Signs, Notices and Simple Instructions | 标识、通知与简单指令英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.025 | Housework and Tidying Up | 家务与整理英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.026 | Feelings and Everyday Needs | 感受与日常需要英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.027 | Materials, Shapes and Sizes | 材料形状与大小英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.028 | Using a Learner’s Dictionary | 零基础英语词典查词方法
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.029 | Pronouns and Possessive Words | 人称代词与所属词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.030 | Articles and Quantity Words | 冠词与数量词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.031 | Prepositions of Place, Time and Movement | 地点、时间与方向介词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.032 | Connecting and Sequence Words | 连接词与顺序词
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.033 | Frequency and Habit Words | 频率与习惯英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.034 | Degree and Intensity Words | 程度与强度英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.035 | Ability, Permission and Possibility Words | 能力、许可与可能性英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.036 | Comparison and Difference Words | 比较与差异英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.037 | Negation and Limiting Words | 否定与限制英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.038 | Time Reference Words | 时间指示英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.039 | Adverbs of Manner and Speed | 方式与速度英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.040 | Thinking, Knowing and Memory Words | 思考、理解与记忆英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.041 | Animals and Pets | 动物与宠物英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.042 | Kitchens, Meals and Cooking | 厨房、餐食与烹饪英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.043 | Hotels and Accommodation | 酒店与住宿英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.044 | Restaurants and Eating Out | 餐馆与外出用餐英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.045 | Holidays and Vacation Travel | 假期与旅行英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.046 | Airports and Flights | 机场与航班英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.047 | Celebrations, Parties and Special Days | 庆祝、聚会与特别日子英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.048 | Accessories and Personal Belongings | 配饰与随身物品英语词汇
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How to Learn Basic English Vocabulary (Chinese Edition) | Lesson No.049 | Cinema, Television and Entertainment | 电影、电视与娱乐英语词汇
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.
