What is the difference between Grade C and Grade B in OET writing?

On the per-criterion scale, Grade C letters typically score 3 or 4 on most of the six writing criteria; Grade B letters score 5 or 6. The criteria are Purpose (0–3), Content (0–7), Conciseness & Clarity (0–7), Genre & Style (0–7), Organisation & Layout (0–7), and Language (0–7). To move from C to B, most candidates need to lift one or two criteria from Band 4 to Band 5 — usually Conciseness & Clarity or Genre & Style. This is mechanical, not conceptual.

How long does it take to go from Grade C to Grade B in OET writing?

Three to six weeks of targeted practice is typical when the candidate has identified the specific criterion costing them the grade. Without that diagnosis the same candidate can spend three months on broad practice with no improvement. The bottleneck is almost never time — it is precision.

Why do Grade C letters not pass?

Grade C letters typically fail at the Band 4 level on Conciseness & Clarity, Genre & Style, or Organisation & Layout — not on grammar or vocabulary. The classic Grade C patterns are vague descriptors instead of objective measures, conversational register slips, critical information buried in late paragraphs, and a Purpose that informs rather than acts. Each of these is fixable in a single draft.

Can a nurse pass OET with Grade C?

For UK NMC registration, nurses can currently meet the language requirement with Grade C+ in Writing and Speaking provided other sub-tests are at Grade B. Most other healthcare professions and most non-UK regulators require Grade B across the board. Always verify your specific registration body's current requirements before relying on a Grade C result.

Retake Playbook · Updated 11 May 2026

You scored C. You need B. Here's what actually changes.

The gap between Grade C and Grade B is not knowledge — it is precision. Most retake candidates are one or two specific habits away from a pass, and those habits are mechanical edits, not concepts to relearn. This page lays out exactly what to start doing and what to stop.

Get a per-criterion diagnosis — from $12 Full retake strategy

Where Grade C letters lose marks

Across 11,000+ corrected letters since 2014, the same pattern shows up in almost every Grade C letter we read. The candidate's grammar is fine. The vocabulary is fine. The clinical knowledge is fine. The marks are leaking from three specific criteria, in this order:

Conciseness & Clarity at Band 4 — vague descriptors instead of objective measures.
Genre & Style at Band 3 or 4 — conversational register slips that compound across the letter.
Organisation & Layout at Band 4 — critical information buried in late paragraphs.

Lift one of these to Band 5 and you are in C+. Lift two and you are in B. Lift all three and you are at the top of Grade B — sometimes Grade A. Every fix in this page targets one of these three.

The per-criterion gap, plainly

Here is exactly what Band 4 (Grade C territory) looks like versus Band 5 (Grade B territory) on each criterion. If you have a recent corrected letter, find your weakest criterion and read the relevant row twice.

Criterion	Band 4 (C)	Band 5 (B)
Purpose	"I am writing about Mr X who is being moved to your unit"	"I am transferring Mr X for ongoing post-op mobilisation — please continue rehabilitation"
Content	"She broke her hip. She is doing well."	"Right neck-of-femur fracture, DHS fixation 7 May. Mobilising with Zimmer frame, two-person assist."
Conciseness & Clarity	"Pain which she says is much better than before"	"Pain controlled at 2/10 rest, 4/10 movement"
Genre & Style	"She takes tablets for her blood pressure. Let me know if you need more info. Many thanks."	"Hypertension controlled on amlodipine 5mg daily. Please contact me should further information be required. Yours sincerely."
Organisation & Layout	Social context buried in paragraph four when it should drive the discharge plan	Social context in paragraph two, immediately after Purpose, because it shapes everything that follows
Language	Correct but plain — short subject-verb-object sentences only	Correct and varied — subordinate clauses, parallel construction, professional collocations

Start doing this. Stop doing that.

The single most useful list any Grade C candidate can hold in their head while writing the next letter.

Start doing

+ Lead with the action requested — not the discharge or transfer statement.
+ Quantify everything — pain scores, mobility level, NIHSS, GCS, dose and frequency.
+ Section the letter — Purpose / Background / Examination / Plan, with a paragraph each.
+ Front-load critical social context — it drives the receiver's actions.
+ Bullet medication lists where there are three or more drugs.
+ Close with a direct request — "Please review at four weeks" — not three layers of courtesy.

Stop doing

− Including occupation and marital status when they do not affect the care plan.
− Vague descriptors — "she is doing well", "pain is much better", "she takes tablets".
− Informal register — "tummy", "moved", "let me know", "Many thanks".
− Triple-hedged closings — "I would be grateful... Thank you... Kind regards".
− Five medications buried in a running sentence.
− Reassurance phrases in clinical letters — "I am confident you will manage well".

The three-week C-to-B plan

Three weeks of focused practice converts most Grade C candidates to Grade B, provided they have a per-criterion diagnosis to work from before starting.

Week 1 — Diagnose your weakest criterion

Submit one letter for criterion-by-criterion marking. Note the criterion sitting at Band 4. That single criterion is your target for the next two weeks.

Week 2 — Drill that criterion in isolation

Write one letter per day for seven days. After each letter, rewrite only the criterion you are drilling. If your weak criterion is Conciseness & Clarity, ignore the rest of the letter — drill only the wordy passages. Submit two of these for marking.

Week 3 — Timed full letters

Three timed letters under exam conditions. Submit all three. If the criterion you drilled now scores Band 5 or 6, you are ready to book the retake. If it is still Band 4, give yourself another week — the fix is not yet automatic.

Diagnose your weakest criterion first

Without a per-criterion diagnosis, three weeks of practice can make a Grade C letter worse, not better. Submit one letter for criterion-by-criterion marking from $12, returned within 24 hours, and know exactly what to drill before you start.

Submit a diagnostic letter — from $12 How we mark

Reviewed by Dr Mariam — PhD in English, 20+ years of OET expertise — or her trained OET writing team.