P51 · DELF B2 Diagnostic, Notice-Your-Mistakes & Mocks

the ease-of-progress engine and the fossilization-breaker

The engine that drives the whole discipline: a four-axis diagnostic that finds where progress is easiest, and the daily notice-your-mistakes loop — spaced reminders, low-stakes checkpoints and a weekly review — that finally surfaces and corrects errors five years of immersion never fixed.

P51 is the discipline's engine room. It owns no vocabulary lists and no grammar chapters — it owns the two mechanisms that decide whether anything else works:

The four-axis diagnostic. One representative task per épreuve, scored against B2, then ranked by ease of progress into quick wins, steady work and the long game. The output is a personalised sequence: where to spend this month's effort, and at what cadence.

The notice-and-review loop. The daily correction cycle for fossilized errors — produce, see the gap, name the category, re-attempt — feeding a personal error profile that drives spaced rule/exception reminders, low-stakes retrieval checkpoints every 3-5 lessons, and a weekly review that re-ranks the axes as they close.

Work here is deliberately small and daily. The full B2 mock joins this pillar once all four axes have content to mock against.

Measureone task per épreuveRankby ease of progressSequenceyour order, not the syllabusRe-rankweekly, as axes close
Measure four axes, work where progress is cheapest, and re-measure often enough that the plan stays yours.
P51 · DELF B2 Diagnostic, Notice-Your-Mistakes & Mocks — TransformerLab