OET Grade A vs Grade B: What Actually Separates Them

Grade A is the rarefied air of OET Writing. Most candidates aim for Grade B because that is what the regulators require, and rightly so. But every cohort has a small group who want to know what would push them higher, either for personal satisfaction or for competitive academic applications. This article compares Grade A and Grade B criterion by criterion under the 2026 rubric, with concrete examples and a clear view of where the work actually sits.

What the OET grade scale actually means

OET reports writing scores on the 0 to 500 scale, mapped to letter grades. Grade B sits roughly between 350 and 440. Grade A sits roughly between 450 and 500. The official band descriptors describe Grade B as a strong, fully effective performance with only minor lapses, and Grade A as a sophisticated, fully successful performance with consistent control. The gap looks small on paper. In practice, the work required to close it is disproportionately large, because the top of the scale rewards features that take time to build.

For the full breakdown of what Grade B requires under the 2026 rubric, see our OET writing criteria for Grade B guide.

Purpose: how the criteria diverge

Grade B Purpose requires that the reader understands why the letter is being written and what is being requested by the end of the opening paragraph. Grade A Purpose requires that the reader understands the same thing by the end of the first sentence, and that the request is calibrated precisely to the recipient’s role.

Example, Grade B opening: “I am writing to refer Mrs Khan, a 67-year-old patient with progressive shortness of breath. She requires cardiology assessment.”

Example, Grade A opening: “I am writing to refer Mrs Khan, a 67-year-old patient with six months of progressively worsening exertional dyspnoea, for cardiology assessment with a view to possible echocardiography and angiography given her cardiovascular risk profile.”

Both openings work. The Grade A version signals not just the referral but the likely investigations the writer expects the cardiologist to consider. The Purpose is sharper because the writer has thought about what the recipient will do with the letter.

Content: clinical relevance and selectivity

Grade B Content covers all the relevant clinical information from the case notes and leaves out clearly irrelevant detail. Grade A Content goes further. It selects, condenses, and synthesises. A Grade A letter rarely repeats information across paragraphs. Each clinical fact appears once, in the paragraph where it has the most diagnostic or therapeutic weight.

The 2026 rubric increased the weight on clinical relevance under Content. This change has narrowed the gap between B and A at the upper end of Content, because Grade B now requires more thought about relevance than it did in 2024. But the synthesis required for Grade A still sits beyond Grade B.

Conciseness and Clarity: the difference in five words

Grade B Conciseness avoids unnecessary repetition and keeps within the 180 to 200 word window. Grade A Conciseness goes further by trimming filler phrases that Grade B candidates often leave in. Phrases like “It is worth noting that,” “Please be advised that,” and “In light of the above” are common in Grade B writing. Grade A writing replaces them with stronger verbs or removes them entirely.

A simple test: read each sentence and ask whether removing five words would change the meaning. If not, remove them.

Genre and Style: where register signals expertise

Grade B Genre and Style maintains a consistent professional register throughout the letter. Grade A Genre and Style does this and also signals genre awareness. A Grade A referral reads like a referral from start to finish. A Grade A discharge letter reads like a discharge letter. The reader can tell the genre from any paragraph, not just the opening.

This is hard to teach because it depends on extensive reading in the genre. Most Grade A candidates have read hundreds of authentic referrals, discharge summaries, and transfer letters during their clinical practice. The vocabulary, phrasing, and rhythm of those documents sit in their working memory and surface when they write.

Organisation and Layout: paragraphing as argument

Grade B Organisation uses clear paragraph breaks aligned to logical sections. Grade A Organisation uses paragraphing as part of the argument structure. Each paragraph develops one idea, and the paragraph order builds toward the closing request. The reader feels carried forward, not just informed.

A useful exercise is to write a one-sentence summary of each paragraph. If the summaries, read in order, tell a coherent mini-story, the Organisation is at Grade A level. If they read like a list, the Organisation is at Grade B.

Language: vocabulary, grammar, and the longest gap

Language is where the Grade A versus Grade B gap is widest. Grade B Language demonstrates a wide range of vocabulary and grammatical structures with only minor errors. Grade A Language demonstrates sophisticated vocabulary range and grammatical control with errors so rare that the reader does not notice them.

The vocabulary bar at Grade A is not about using rare or technical words. It is about precision. Grade A writers choose the right word, not the longest word. A Grade A writer reaches for “progressively worsening” rather than “getting worse over time.” They use “exertional” rather than “when active.” This precision is built from reading, not from word lists.

Grammar at Grade A is similarly precise. Tense sequences are controlled across long sentences. Articles are consistently correct. Conditional structures are used naturally where they fit, rather than avoided.

For targeted work on grammar, see our OET writing grammar problems guide.

Side-by-side criterion comparison

The table makes the pattern visible. Grade B is “very good.” Grade A is “very good with one more layer of refinement on each criterion.”

When Grade A is actually worth pursuing

For healthcare professionals working toward regulator registration, Grade A rarely justifies the extra months of preparation. The NMC, GMC, AHPRA, GDC, GPhC, HCPC, and NMBI all accept Grade B. Grade A is more relevant for English teachers preparing CV evidence, researchers preparing for competitive academic posts, or candidates applying for highly selective postgraduate clinical programmes where the language standard is a discriminator.

For most candidates, the better question is not Grade B versus Grade A. It is Grade C+ versus Grade B. That is where the regulatory threshold sits, and where targeted correction work pays the highest return.

For the supporting criteria documentation, see our OET writing criteria page and OET writing band score B page. The official scoring criteria reference is at OET writing scoring criteria.

How to know which gap you actually have

Before committing to Grade A preparation, get an honest read on where you currently sit. Many candidates assume they are at Grade B but are scoring at the top of Grade C+. Others assume they are stuck at Grade B but have one criterion holding them back from Grade A.

A diagnostic letter, marked criterion by criterion, will tell you which criteria are at B, which are at C+, and which are at A. Once you see the profile, the next steps become obvious. If five criteria are at A and one is at C+, the work is in that one criterion. If all six are at B with no peaks, you are in the steady part of the Grade B band and the path to A requires sustained reading and writing volume over months.

Our human correction at OET writing services provides exactly this criterion-by-criterion feedback. Most candidates who follow a structured correction loop see their profile clarify within four to six letters.

Final thoughts

Grade A is a meaningful achievement, but it is not the regulator’s standard. For most healthcare professionals, Grade B is the right target, and the time spent reaching for A is often better spent on the rest of the registration pathway. For the small group who do want to push higher, the work is in Language and in Genre and Style, and it is built from reading in the genre, writing under marker feedback, and refining over months rather than weeks.

If you are still working toward Grade B, our human correction service at OET writing services and the pricing options at pricing are designed exactly for the C+ to B transition. If you are at Grade B and aiming higher, we can discuss a longer correction plan with a focus on the upper-band criteria.