Why am I stuck at band 6.5 in IELTS writing? 4 real causes

A 6.5 in IELTS Writing is almost never a general weakness in English. It is normally one or two of the four criteria scoring 6 while the others reach 7, and because your Test Report Form gives you a single Writing band rather than four, nothing tells you which ones.

That is why more practice essays do not move the score. Practice repeats whatever you already do, including the one behaviour that is capping you. This article takes the four patterns that produce a 6.5, each tied to the descriptor wording that creates it, and ends with a way to work out which is yours.

Three criteria at 7 and one at 6 is what a 6.5 usually looks like from the inside.

What a 6.5 is actually made of

Each writing task is marked on four criteria. For Task 2 they are Task Response, Coherence and Cohesion, Lexical Resource, and Grammatical Range and Accuracy; for Task 1 the first of the four is Task Achievement instead, and the difference between those two is set out in Task Achievement vs Task Response. Within a task the four are weighted equally.

Your two task scores are then combined into one Writing band. IELTS publishes that "The assessment of Task 2 carries more weight in marking than Task 1", so Task 2 is the heavier of the two. The exact ratio is widely quoted but is not part of the official wording, so treat any specific percentage you read as a working assumption rather than a rule.

The practical consequence is what matters here. A 6.5 is not a score that describes your English as a whole. It is an average, and averages hide their components: three criteria at 7 with one at 6, or two at 7 and two at 6, both round into the same reported number. Somewhere in your last essay there is a specific descriptor line you did not meet, and it has a name.

The four causes below are those lines, in the order candidates most often get them wrong.

Cause 1 — Lexical Resource: accurate, but narrow

This is the most common cap on a script that its writer thinks is clean, because nothing in it is wrong.

Band 6: "The resource is generally adequate and appropriate for the task. The meaning is generally clear in spite of a rather restricted range or a lack of precision in word choice."

Band 7: "The resource is sufficient to allow some flexibility and precision. There is some ability to use less common and/or idiomatic items. An awareness of style and collocation is evident, though inappropriacies occur."

Read the two together and the band 6 line is describing an essay with no vocabulary errors in it. "Restricted range" and "a lack of precision" are not mistakes; they are the absence of something. An essay built out of important, problem, good, many people, affect is correct English and stops at 6, because band 7 asks for flexibility and precision — the right word rather than a serviceable one.

The opposite failure lands in the same place. Reaching for impressive vocabulary produces collocation errors — make a solution, a huge amount of people — and band 7 explicitly requires "an awareness of style and collocation". One misused ambitious word costs more than ten plain accurate ones, so vocabulary lists memorised the week before the test tend to move this criterion down rather than up.

How to check. Take ten content words from your last essay — nouns, verbs, adjectives, not linking words. How many could be replaced by a more precise word you already know but did not reach for under time pressure? If the answer is most of them, this is your 6. The two versions of one essay in band 6.5 vs band 7 show the difference at sentence level.

Cause 2 — Coherence and Cohesion: organised, but mechanical

Band 6: "Information and ideas are generally arranged coherently and there is a clear overall progression. Cohesive devices are used to some good effect but cohesion within and/or between sentences may be faulty or mechanical due to misuse, overuse or omission."

Band 7: "Information and ideas are logically organised, and there is a clear progression throughout the response. A range of cohesive devices including reference and substitution is used flexibly but with some inaccuracies or some over/under use."

Mechanical is the word doing the work at band 6, and it describes exactly the habit most preparation material teaches: Firstly at the start of the second paragraph, Moreover at the start of the third, In conclusion at the start of the fourth. Those are labels announcing that a paragraph has begun. They are not cohesion, because they carry no information about how this idea relates to the previous one.

Note also what band 7 names that band 6 does not: "reference and substitution". Reference is pronouns and demonstratives — this, these, such, the latter — pointing back at something specific. Substitution is replacing a repeated phrase with a shorter stand-in — doing so, one, the same. Neither appears in the band 6 line, and neither is a connector. Candidates who add more connectives to fix cohesion are adding to the category the descriptor already calls overused.

How to check. Delete every Firstly, Moreover, In addition and In conclusion from your last essay and read it again. If nothing was lost, those words were decoration and your cohesion is sitting at 6. Linking words are keeping you at band 6 takes the same descriptor apart in full.

Cause 3 — Task Response: a position stated, not developed

Band 6: "The main parts of the prompt are addressed (though some may be more fully covered than others). A position is presented that is directly relevant to the prompt, although the conclusions drawn may be unclear, unjustified or repetitive."

Band 7: "The main parts of the prompt are appropriately addressed. A clear and developed position is presented. Main ideas are extended and supported."

Two words separate these. Developed and extended.

Band 6 states the idea. Band 7 is the same idea carried two steps further.

A band 6 body paragraph typically runs: claim, example, restatement of the claim. Everything in it is relevant and the position is perfectly clear — which is why it feels finished to the person who wrote it. What it never does is take the idea a step further: why the claim holds, what follows from it, what it costs, who it does not apply to.

The band 6 line also warns that conclusions may be "repetitive", and a conclusion that restates the introduction in different words is the single most common ending in essays scoring 6.5. Task 2 conclusions that reach band 7 scores several against this wording.

The other half of the band 6 clause — "some may be more fully covered than others" — is where two-part questions are lost. Count the parts of the prompt before you plan, and give each one a paragraph.

How to check. In each body paragraph, find the sentence that answers why is that true or what follows from it. If a paragraph has no such sentence, it is stated rather than developed. The same essay rewritten from band 6 to band 7 tags every edit to the criterion it moved.

Cause 4 — Grammatical Range and Accuracy: the drop where the ambition rises

Band 6: "A mix of simple and complex sentence forms is used but flexibility is limited. Examples of more complex structures are not marked by the same level of accuracy as in simple structures."

Band 7: "A variety of complex structures is used with some flexibility and accuracy. Grammar and punctuation are generally well controlled, and error-free sentences are frequent."

The band 6 wording assumes you already write complex sentences. What it describes is a pattern: your simple sentences are clean and your complex ones are not, so accuracy falls exactly where you reach. Band 7 does not ask for more ambitious structures. It asks for that drop to stop.

This has a direct consequence for what you should do about it. Adding a fifth relative clause to an essay that already has four changes nothing; correcting the two that are wrong changes the criterion. Punctuation counts here too — it sits inside this criterion, not a separate one.

How to check. Mark every sentence in your last essay that contains a subordinate clause, then check only those for errors. If your mistakes cluster there while your short sentences are clean, this is your 6. The four structures that reliably count as range are in complex sentences for band 7.

How to find out which one is yours

Take your most recent essay — one you wrote under time, not a corrected version — and go through it four times, once per criterion, using the checks above. Marking against one criterion at a time is the whole method; reading an essay looking for "mistakes" finds grammar and misses the other three.

Then rank what you find by how fast it moves. Task Response and Coherence and Cohesion respond to decisions taken before you write: count the parts of the prompt, commit to a position, plan one development step per paragraph, cut the connectors that carry no information. Those are habits, and they can change in a week. Lexical Resource and Grammatical Range and Accuracy track your actual English level and move over months. If one of each is at 6, fix the planning one first.

Two more things worth separating. If your Task 1 is weak but your Task 2 is fine, you are not looking at a band 6.5 problem at all — you are looking at a different criterion with different wording, and Task Achievement vs Task Response is the place to start. And if the gap you are closing is smaller than a full band, band 7 vs band 7.5 shows what the next half looks like.

The full band 5 to 8 wording for all four criteria is in IELTS Writing band descriptors explained, and how to get band 7 in IELTS Writing sets the four out as conditions rather than advice.

FAQ

Why do I keep getting 6.5 in writing no matter how much I practise?

Because practice repeats whatever you already do. A 6.5 is normally one or two criteria scoring 6 while the others reach 7, and writing more essays the same way reproduces the same split. The band moves when you identify which criterion is the low one and change that specific behaviour.

Can I see which criterion scored low?

Not from your Test Report Form. It reports one band for Writing, not four. The only routes to a per-criterion view are marking your own essay against the public descriptors, a teacher who marks by criterion, or a tool that scores each criterion separately.

Which criterion is fastest to move from 6 to 7?

Usually Task Response or Coherence and Cohesion, because both respond to planning decisions you can take before you write. Lexical Resource and Grammatical Range and Accuracy track your English level and move more slowly.

Does one criterion at band 6 drag the whole score down?

The four criteria are weighted equally within a task, so one 6 among three 7s pulls the average down without necessarily costing a half band on its own. Two criteria at 6 is what typically produces a 6.5 rather than a 7.

Is my grammar the problem if my writing is stuck at 6.5?

Often not. Grammar is the most visible thing to check, so candidates check it first — but an essay with very few errors can still be capped by an undeveloped position, mechanical linking, or vocabulary that is accurate but narrow.

Related reading

• Band 6.5 vs band 7 IELTS essay — the same question answered at both bands, scored side by side
• Band 6 to band 7: the same essay rewritten — every edit tagged to the criterion it moved
• Linking words are keeping you at band 6 — what the cohesion descriptor actually asks for
• Complex sentences for band 7 — the four structures that count as range

All descriptor wording quoted here is from the public Writing band descriptors updated in May 2023, published by IELTS and the British Council.