PSLE OS (Singapore) — Verification Under Compression + Time Pressure

SYSTEM: Education OS
MODULE: PSLE OS (Singapore)
GATE: PSLE Verification Gate (Primary School Leaving Examination)
ZOOM LINK: Z6 (SGP nation) ↔ Z5 (SGP-SIN city) ↔ Z0 (student)
REFERENCE: CivOS (Phase P0–P3)
PRIMARY PURPOSE:
  Verify that a student can:
    - execute under time pressure (timed reliability)
    - transfer across wrappers (novelty robustness)
    - sustain performance across multiple papers
  while preventing late-repair cliff failures caused by ramp compression.

GATE DEFINITION: PSLE
FUNCTION:
  Convert multi-year learning into a single verification window that measures:
    - timed execution stability (P-S5)
    - transfer under wrapper variation (P-S4)
    - retrieval without cues (P-S1)
OUTPUT:
  secondary routing signals + readiness verification
FAILURE COST:
  pathway restriction + confidence collapse + delayed repair pipeline

P0 (Fragile):
  Can do familiar worksheets; collapses on timed papers or new wrappers.
P1 (Unstable):
  Some topics strong; volatility high; performance swings across papers.
P2 (Stable):
  Core topics reliable; timed performance improving; some wrapper sensitivity.
P3 (Reliable):
  Consistent across full papers under time; recovers after mistakes;
  transfer holds on unseen wrappers; low volatility.

DOMINANT GF CLUSTER (PSLE):
  GF3 Compression Without Buffers (ramp exceeds readiness)
  GF6 Time-Pressure Execution Collapse (timed cliffs)
  GF9 Transfer Failure Under Novelty (format shifts)
  GF7 Late Repair Trap (repair starts too late)
  GF2 Practice Without Model (volume without spine)
  GF1 Early Language Drift (esp. word problems + English)
  GF8 Tuition Masking (dependency misread as competence)
  GF12 Burnout Tail (ramp overload)

FAILURE_MODES (PSLE):
  P-F01: Ramp starts while spine incomplete (GF3)
  P-F02: Timed gap huge (untimed ok, timed collapse) (GF6)
  P-F03: Wrapper sensitivity (worded/diagram variations break execution) (GF9)
  P-F04: Retrieval fragility (needs cues, cannot start problems) (P-S1 low)
  P-F05: Careless-error density spikes under time (execution instability)
  P-F06: Late repair trap (GF7) (no runway left)
  P-F07: Tuition masking (G-M7 high) (can perform only with external scaffolds)
  P-F08: Burnout tail (GF12) (fatigue → volatility → regression)
  P-F09: English comprehension drift infects other subjects (GF1 coupling)

PHASE SENSORS (PSLE):
  P-S1 retrieval reliability
  P-S2 error histogram (concept/execution/attention)
  P-S3 time-to-solve distribution
  P-S4 transfer under wrapper variation
  P-S5 timed stability variance

PSLE GATE SENSORS:
  PSLE-S1: Ramp compression index (pace + stakes density rise)
  PSLE-S2: Buffer thickness proxy pre-ramp (readiness)
  PSLE-S3: Timed vs untimed gap (primary execution cliff)
  PSLE-S4: Transfer gap under wrapper variation (novelty cliff)
  PSLE-S5: Volatility index across full papers (P-S5 focused)
  PSLE-S6: Repair latency vs exam horizon (can it close in time?)
  PSLE-S7: Tuition masking factor (dependency vs competence) (G-M7 aligned)
  PSLE-S8: Burnout risk proxy (load vs recovery capacity)

EARLY WARNING (PSLE):
  Trigger repair immediately if any are true:
    - PSLE-S2 buffer thickness below threshold at ramp onset
    - PSLE-S3 timed gap widening
    - PSLE-S4 transfer gap persists across wrapper families
    - PSLE-S5 volatility high across timed papers
    - PSLE-S6 repair latency exceeds remaining runway
    - PSLE-S8 burnout risk rising (fatigue + regression signals)

REPAIR LOOPS (PSLE):
GR8 Early-Warning Thresholds (signature):
  - enforce repairs BEFORE ramp becomes irreversible
GR1 Buffer Build Loop:
  - build core spine (small-set mastery + retrieval)
  - stop topic hopping; lock foundations
GR3 Transfer Loop:
  - wrapper variation audits (worded/diagram/graph/context)
  - mixed practice structured by concept families
GR4 Time-Pressure Loop:
  - timed micro-sets
  - recovery protocol: skip/return + error containment + checking
GR2 Error-Log Closure Loop:
  - classify recurring errors
  - micro-drill root causes
  - retest timed until repeats collapse
GR5 Language-Base Loop (when GF1 present):
  - command words, comprehension parsing, vocabulary retrieval
  - convert reading → answering reliably
GR6 Continuity Loop:
  - stabilize routine; prevent “reset weeks”
  - consolidation windows (especially during ramp)
GR11 Pressure-Safety Scheduling (burnout control):
  - cap load below recovery capacity
  - protect sleep and consolidation to prevent GF12 tail
GR7 Tail Visibility / Masking Control (system-level):
  - reduce tuition masking by requiring independent proofs

FAILURE TRACE (PSLE):
  GF2 practice without model →
  GF3 compression exceeds buffers →
  GF9 wrapper novelty collapse →
  GF6 timed execution collapse →
  GF7 late repair trap →
  PSLE underperformance + volatility
REPAIR TRACE (PSLE):
  GR8 early triggers →
  GR1 buffer build (spine mastery) →
  GR3 wrapper audits →
  GR4 timed stability + recovery protocol →
  GR2 closure of repeated errors →
  (GR5 language base if needed) →
  P3 reliability across full timed papers

PSLE READY (P3 PROOF):
  - PSLE-S2 buffer thickness at target pre-ramp
  - PSLE-S3 timed gap small (timed≈untimed performance)
  - PSLE-S4 transfer holds across 3 wrapper families
  - PSLE-S5 volatility low across 3 full timed papers
  - P-S2 error histogram shows declining careless-repeat density
  - PSLE-S6 repair latency short enough to stay ahead of new ramps
  - PSLE-S7 tuition masking low (independent stability)

PORTS:
  - Singapore Nation Education OS (Z6)
  - Singapore City Education OS (SGP-SIN) (Z5)
  - World Education OS (W0)
  - W4 GF Library (failure archetypes)
  - W5 GR Library (repair mechanisms)
  - (future) O-Level OS (Singapore)
  - Comparatives:
      London↔Singapore (Z5)
      UK↔SGP (Z6)

LOCK:
  PSLE OS is a reliability system:
    detect drift early, build buffers before ramps,
    stabilise timed execution, and verify transfer under novelty.
  PSLE failure is usually a late-repair cliff, not a sudden weakness.