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eduKate Sengkang Learning Estate Hub | 20 Upgrade Routes

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

Browse every published Post

3746 results found

PSLE Science Reality Lab Vol No.510 | “Composite Reflectivity = 55 dBZ” — Was 55 dBZ Measured at the Same Height Everywhere?

11–16 minutes
PSLE Science Reality Lab Vol No.509 | “Pressure = 2000 dbar” — Is the Argo Float Exactly 2000 m Deep?

11–17 minutes
PSLE Science Reality Lab Vol No.506 | “Wind Barb = 25 kt” — What Does the Weather Symbol Actually Encode?

10–16 minutes
PSLE Science Reality Lab Vol No.505 | “Power Factor = 0.90” — Does That Mean the Device Is 90% Energy Efficient?

13–19 minutes
PSLE Science Reality Lab Vol No.503 | “Cloud-Top Height = 12 km” — Was 12 km Directly Measured at Every Pixel?

14–21 minutes
PSLE Science Reality Lab Vol No.502 | “Peak Ground Acceleration = 30% g” — Was the Ground Accelerating at 30% g the Whole Time?

14–21 minutes
PSLE Science Reality Lab Vol No.501 | “Leq = 70 dBA” — Was the Sound 70 dBA the Whole Time?

13–19 minutes
PSLE Science Reality Lab Vol No.499 | “Q30 Sequencing Quality” — Was the DNA Read 30 Times, or Is It 30% Accurate?

13–19 minutes
PSLE Science Reality Lab Vol No.498 | “Occupancy Probability = 0.80” — Does the Species Occupy 80% of This Grid Cell?

13–20 minutes
PSLE Science Reality Lab Vol No.497 | “Band 13 = 10.33 µm” — Did the Satellite Measure Only One Exact Wavelength?

14–21 minutes
PSLE Science Reality Lab Vol No.495 | “Total Exposure Time = 20 Hours” — Was This One 20-Hour Photograph?

12–18 minutes
PSLE Science Reality Lab Vol No.494 | “5σ Discovery” — Does Five Sigma Mean the Signal Is Five Times Stronger Than the Noise?

13–19 minutes
PSLE Science Reality Lab Vol No.493 | “Lightning Count = 100” — Were There 100 Separate Flashes?

15–22 minutes
PSLE Science Reality Lab Vol No.492 | “The Funnel Plot Looks Asymmetrical” — Does That Prove Studies Were Hidden?

21–32 minutes
PSLE Science Reality Lab Vol No.491 | “This Wind Streamline Curves Here” — Did One Air Parcel Follow That Exact Path?

15–22 minutes
PSLE Science Reality Lab Vol No.490 | “Warm-Up Time = 30 min” — Can We Trust the Reading Immediately After Switch-On?

13–19 minutes
PSLE Science Reality Lab Vol No.486 | “MPN = 100 per 100 mL” — Were Exactly 100 Microorganisms Counted?

11–16 minutes
Top 10 Model-Based Reasoning Skills Worth Learning

21–32 minutes
Top 10 Statistical Reasoning Skills Worth Learning

22–33 minutes
PSLE Science Reality Lab Vol No.489 | “Data Updated Today” — Were the Measurements Collected Today?

11–17 minutes
PSLE Science Reality Lab Vol No.485 | “Extent of Occurrence = 10,000 km²” — Does the Species Occupy Every Point Inside That Boundary?

10–15 minutes
Top 10 Systems Thinking Skills Worth Learning

22–33 minutes
PSLE Science Reality Lab Vol No.484 | “Rainfall = T (Trace)” — Does That Mean No Rain Fell?

11–16 minutes
PSLE Science Reality Lab Vol No.488 | “Dashed Fault Line” — Does a Broken Line Mean the Fault Stops or Is Not Real?

10–15 minutes
Top 10 Argumentation Skills Worth Learning

21–32 minutes
Top 10 Causal Reasoning Skills Worth Learning

20–31 minutes
PSLE Science Reality Lab Vol No.483 | “IP67” — Does That Mean a Device Is Waterproof at Any Depth for Any Length of Time?

12–18 minutes
PSLE Science Reality Lab Vol No.487 | “Species Distribution Map” — Does the Shaded Area Mean the Species Lives Everywhere Inside It?

15–22 minutes
Top 10 Analogical Reasoning Skills Worth Learning

20–30 minutes
Top 10 Spatial Reasoning Skills Worth Learning

21–31 minutes
Top 10 Information Foraging Skills Worth Learning

25–38 minutes
PSLE Science Reality Lab Vol No.482 | “Solar Flare X2” — Is It Just Two Units Stronger Than M2?

10–14 minutes
PSLE Science Reality Lab Vol No.481 | “Earthquake Beachball” — Is the Black-and-White Circle a Map of the Fault on the Ground?

11–17 minutes
PSLE Science Reality Lab Vol No.480 | “This Area Is Jurassic” — Did Every Rock Here Form at the Same Exact Time?

11–17 minutes
PSLE Science Reality Lab Vol No.479 | “Preserved Specimen Record: 1924” — Does That Mean the Species Still Lives There Today?

9–14 minutes
PSLE Science Reality Lab Vol No.478 | “Earthquake Depth = 10 km” — Was It Really Measured Exactly 10 km Deep?

11–16 minutes
PSLE Science Reality Lab Vol No.477 | “DYFI Intensity VI for This ZIP Code” — Did Every Place There Experience Intensity VI?

11–17 minutes
PSLE Science Reality Lab Vol No.476 | “Coordinate Uncertainty = 1000 m” — Was the Real Location Exactly 1000 m From the Map Point?

10–15 minutes
PSLE Science Reality Lab Vol No.475 | “Complete Checklist” — Did the Observer Detect Every Bird That Was Present?

11–16 minutes
PSLE Science Reality Lab Vol No.474 | “Magnitude 2 vs Magnitude 4” — Is 4 Twice as Bright as 2?

10–14 minutes
PSLE Science Reality Lab Vol No.473 | “Long-Exposure Star Trails” — Did the Stars Really Draw Bright Lines Across Space?

10–14 minutes
PSLE Science Reality Lab Vol No.472 | “30× Genome Coverage” — Was Every DNA Base Read Exactly 30 Times?

9–14 minutes
PSLE Science Reality Lab Vol No.471 | “Phase-Folded Light Curve” — Is This One Continuous Orbit?

11–16 minutes
PSLE Science Reality Lab Vol No.470 | “Research Grade” — Does That Mean the Species Identification Is Definitely Correct?

11–16 minutes
PSLE Science Reality Lab Vol No.469 | “GPS Track” — Did the Animal Really Walk Along Every Straight Line on the Map?

11–17 minutes
PSLE Science Reality Lab Vol No.468 | “Data Deficient” — Does That Mean the Species Is Safe, Rare or Unstudied?

11–17 minutes
PSLE Science Reality Lab Vol No.467 | “Holotype” — Is This Specimen the Average Member of the Species?

13–19 minutes
PSLE Science Reality Lab Vol No.466 | “Raw Image” — Is This Exactly the Original Science Data From the Spacecraft?

10–14 minutes
PSLE Science Reality Lab Vol No.465 | “I² = 80%” — Does That Mean 80% of the Studies Disagree?

8–13 minutes
PSLE Science Reality Lab Vol No.464 | “δ18O = −10‰” — Is 10‰ of the Water Oxygen-18?

9–13 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.