Diagnose Before You Drill: Baseline, Revision Map, Final Check

Problem: candidates study grammar front-to-back, over-drilling strengths while blind spots persist — because nothing diagnosed them. Answer in brief: take a 20-item baseline under timed conditions, revise exactly what the lesson-coded key prescribes, then prove gains on a final check after the course. Scores describe the exercise only — never OET grades. Method, models and 12 tasks below.

Learning outcomes

By the end you will be able to: take a 20-item grammar baseline under 25-minute study conditions with keys closed; score with the all-parts-accurate rule; convert each miss into a lesson-code revision target; sequence revision by code frequency rather than chapter order; and interpret final-check scores within their stated limits. All guidance follows the source book, OET Grammar: Diagnostic and final checks (OET Grammar Diagnostic and Final Checks) (Jobin Thomas, September 2026 edition) — 20-item baseline, 20-item final check, explained keys with lesson codes and revision map, verified by full-text decode and item sampling. Independent preparation; not affiliated with or endorsed by OET — fictional patients, language examples only.

The baseline: 25 minutes that map your course

Take the diagnostic before the course (and the final check only after lesson G24): about 25 minutes each as a study suggestion — not an official time — keys closed, one sitting, no dictionary. Item formats mix production (complete the verb form), correction (fix the faulty sentence) and choice (pick the accurate option), so the baseline samples recognition and production together — the two unequal skills. Attempt every item: blanks diagnose nothing, while wrong answers diagnose precisely. Twenty items cannot cover 24 lessons; they sample the highest-yield points (verb forms, agreement, voice, modals, conditions, articles, prepositions, connectors) — treat gaps found as proven, coverage as sampled.

Scoring honestly: the all-parts-accurate rule

Each item earns one local practice point only when all requested parts are accurate — a corrected sentence with a second error remaining scores zero. Harsh by design: partial credit hides the exact blind spot the map needs. For open answers, the key’s meaning-and-grammar is the standard while equally valid wording is accepted — compare function (tense correct? reference clear? qualifier kept?) rather than words. Record scores per item, not just totals: the pattern (tense items 2/5, article items 0/3) is the diagnosis; the total is merely motivation.

Reading the revision map

Every key entry carries a lesson code (Review G06, G07, G05…) — the map from miss to lesson. Convert scores in three steps: (1) list missed items with their codes; (2) tally codes by frequency — two misses pointing at G14 outrank one at G03; (3) study in frequency order, not chapter order — the weakest band first regardless of its number. A typical map: articles (G14) ×3, past-vs-perfect (G06–G07) ×2, prepositions (G15) ×2 → fortnight plan G14, G06–G07, G15 with workbook drills attached. Re-attempt missed items after each lesson with new facts; the code clears only on explained-correct re-attempt, never on rereading.

The final check and score limits

After G24, the final check repeats the procedure: 25 minutes, keys closed, all-parts-accurate scoring. Compare per-item, not just totals — a rise from 11 to 15 with tense items still failing means the course worked everywhere except where it mattered most. Score limits stated plainly: these scores describe a small course exercise only; they are not calibrated to OET grades, do not predict official results, and must never serve as readiness guarantees. Readiness is judged on official profession-specific tasks under exam conditions — the checks measure grammar learning, which is one input among six Writing criteria and the broader Speaking assessment.

Worked models: diagnosis in action

Labelling: all items below are newly written in the book’s diagnostic patterns (complete/correct/choose + lesson code). The book’s 40 items are not reproduced. Fictional patients; language examples only.

Model 1 — Three items, diagnosed (newly written)

D-a: She (attend) the clinic yesterday. → “attended” (dated past). Code G06. D-b: Correct: “Does she needs assistance?” → “Does she need assistance?” (auxiliary + base). Code G05. D-c: Choose by/until: “Return the form ___ Friday.” → “by” (deadline = no later than). Code G15. Map from three misses: G05, G06, G15 — one lesson each, frequency-tied; study G06 first (tense errors compound fastest).

Model 2 — All-parts-accurate scoring demo (newly written)

Item: Correct: “The patient was arrived at noon, and have waited since.” Attempt: “The patient arrived at noon, and has waited since.” → 1 point (passive misformation fixed; perfect aspect correct). Attempt 2: “The patient arrived at noon and have waited since.” → 0 points (agreement error remains — all parts must be accurate). Note: the rule feels harsh on attempt 2; that harshness is exactly what surfaces the agreement blind spot for G03 revision.

Model 3 — Revision week planned from a map (newly written)

Baseline 12/20; misses: G14 ×3 (articles), G07 ×2 (perfect vs past), G13 ×2 (conditions), singles ×1. Plan: Mon–Tue G14 + workbook drills + re-attempts with new facts; Wed–Thu G07; Fri–Sat G13; Sun mixed re-attempt of all seven. Clearance rule: each code clears on two consecutive explained-correct re-attempts. Note: singles wait — frequency orders, impatience doesn’t.

Model 4 — Final-check comparison read properly (newly written)

Baseline 12 → final 16. Per-item: articles 0/3 → 3/3 (cleared); perfect-vs-past 1/3 → 1/3 (unmoved — the course’s teaching didn’t land here); conditions 1/2 → 2/2. Reading: celebrate G14, re-study G07 with a different method (coursebook lesson + workbook + new-fact re-attempts), hold G13. Limits restated: 16/20 is a practice score, not a grade, not a prediction, not a guarantee — readiness judged on official tasks.

Diagnostic log template (copy per sitting)

One row per item, codes tallied at the foot — the tally orders your fortnight.

Practice bank: 12 tasks with answers

Attempt under 25-minute conditions with keys closed. All items are newly written; fictional patients; language examples only.

Common errors and corrections

• Front-to-back studying: strengths drilled, gaps kept. Correction: baseline first; frequency-ordered revision.
• Partial credit: near-misses banked. Correction: all-parts-accurate or zero.
• Total-only scores: 12/20 with no pattern. Correction: per-item logging with codes.
• Chapter-order revision: G01 first regardless. Correction: weakest code first.
• Single-attempt clearance: reread and retired. Correction: two explained-correct re-attempts with new facts.
• Grade-reading: 16/20 treated as readiness. Correction: limits restated — official tasks judge readiness.

Independent task and self-check

Task (newly written): baseline this week with per-item codes; revise by frequency for a fortnight; final-check after G24 with per-item comparison.

Self-check: were conditions exam-honest? Is scoring all-parts-accurate? Is revision frequency-ordered? Are limits respected? Four yeses = diagnosis driving study.

Study sequence with the book

1. Read the how-to-use and limits; fix conditions and scoring before attempting.
2. Baseline under 25 minutes; log per-item with codes.
3. Revise by code frequency with coursebook + workbook.
4. Clear codes on explained-correct re-attempts with new facts.
5. Final-check after G24; compare per-item, not totals.
6. Re-study unmoved codes differently; judge readiness on official tasks.

FAQs

Can I retake the baseline instead? No — the final check exists for that. Baselines diagnose once; re-attempts target codes.

What if everything scores low? Foundations first (G01–G04), then time frames — the route is cumulative by design.

Are 20 items enough? To sample high-yield points, yes; for full coverage, no. Proven gaps are real; untested lessons still need walking.

Why so strict on scoring? Because partial credit hides the blind spot the map needs. Strictness is diagnostic, not punitive.

How does this volume fit the set? Coursebook teaches, workbook drills, this diagnostic maps and verifies, the key explains. Map before drilling, verify after.

The matching book

OET Grammar: Diagnostic and final checks (OET Grammar Diagnostic and Final Checks) contains the 20-item baseline, 20-item final check, explained keys with lesson codes and the revision map — the diagnostic engine for the OET Grammar set. If mapped revision helped here, the book is where you measure twice. Product page link to be added when the authenticated staging catalogue mapping is available — no URL is invented here.

Keep practising with OET Grammar: Diagnostic and final checks (OET Grammar Diagnostic and Final Checks)

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Sources and editorial note

Teaching follows the verified source PDF (16 pages; baseline + final check with coded keys; confirmed by stream-decode and item sampling). All practice items in this article are newly written; no book item is reproduced. Fictional patients; language examples only, never clinical guidance. Not affiliated with or endorsed by OET; checks are not official tests and scores carry the stated limits. AI-assistance disclosure from the source set applies equally here.