The IELTS mistakes you cannot see yourself

Search "common IELTS mistakes" and you will find lists of twenty or thirty. They are accurate, and most of them describe things you already know you do: you ran over the word limit, you spoke too fast, you spent too long on one reading question.

Knowing about those has not moved your band, which tells you something. The mistakes that hold people at 6.5 are the ones you cannot detect from inside your own answer — because your answer makes sense to you. You know what you meant. The examiner only has what you wrote.

This is written from the marking side; we build the engine that scores speaking and writing on Hilingo. For the official criteria themselves, the source is the IELTS band descriptors, published by the test owners.

Why self-detection fails

IELTS writing is marked on four criteria, weighted equally: task achievement or task response, coherence and cohesion, lexical resource, and grammatical range and accuracy. Speaking is marked on four as well: fluency and coherence, lexical resource, grammatical range and accuracy, and pronunciation.

An overall band is the average of those. So a candidate sitting at 6.5 is almost never uniformly 6.5 — they are usually a 7 in three criteria and a 6 in one, and everything depends on identifying which one. You cannot average your way out of a weak criterion, and you cannot fix a criterion you have not identified.

Here are the ones that hide.

1. You answered a related question, not the question

Criterion: task response. The invisible one, and the most expensive.

Task 2 asks whether the advantages outweigh the disadvantages. You write a strong, well-organised essay about the advantages and disadvantages — and never weigh them. It reads fluently, it has an introduction and a conclusion, and it has not answered the question.

You cannot see this because your essay is coherent on its own terms. Task response is a full quarter of the writing mark, so this alone caps an otherwise band-7 piece at 6.

The check: after writing, read only the question and your conclusion. If the conclusion does not directly answer the words in the question, you drifted.

2. You think connectives are cohesion

Criterion: coherence and cohesion.

"Moreover", "Furthermore", "In addition", "Last but not least" — candidates add these believing they are building cohesion. They are signposting, which is a different thing. Cohesion is whether your ideas actually follow from each other; a paragraph of unconnected points does not become connected because each sentence starts with a linker.

Overusing them is visible to a marker as a pattern and often reduces the score, because mechanical linking reads as exactly that.

The check: delete every linking word from a paragraph. If the ideas still follow in order, your cohesion is real. If the paragraph falls apart, the linkers were doing work the logic should have been doing.

3. You are accurate, but in one structure

Criterion: grammatical range and accuracy. Both words matter, and candidates optimise for the second.

A candidate who writes clean, correct, simple sentences throughout gets a pleasant surprise on accuracy and a hard ceiling on range. Band 7 expects a mix of structures with frequent error-free sentences — not error-free simple sentences only.

This is invisible because nothing in your writing is wrong. You proofread it, you found no errors, you concluded it was good.

The check: count the sentences in one paragraph that contain a subordinate clause. If it is zero or one, range is your ceiling, not accuracy.

4. You reuse your own favourite words

Criterion: lexical resource.

Everyone has a vocabulary they reach for under pressure. Read three of your own essays and you will find the same eight words carrying most of the weight — "important", "beneficial", "aspect", "society". You do not notice because each essay looks fine alone.

Note that the fix is not "use rarer words". Using an unfamiliar word slightly wrong damages lexical resource more than a plain word used correctly. The fix is range within words you actually control.

The check: put three of your essays side by side, not one.

5. Speaking fast feels fluent and is not

Criterion: fluency and coherence.

Candidates who are nervous speak quickly and finish feeling fluent. Fluency in the descriptors is about continuity and the ability to keep going coherently — not speed. Fast speech with restarts, self-corrections and abandoned clauses scores lower than slower speech that holds together.

You cannot hear this in the moment, because the feeling of fluency and the marking of it are different things.

The check: record yourself and count restarts, not seconds.

6. Your pronunciation problem is one sound, not "my accent"

Criterion: pronunciation.

Accent is not marked. Intelligibility is. Most candidates who lose pronunciation marks are not losing them across the board — they are losing them on a small number of specific sounds that they consistently produce away from the target, often ones that do not exist in their first language.

This is close to impossible to self-detect, because you hear your own intended sound rather than the one you made.

The check: you genuinely need something external for this one — either a teacher, or a system that reports pronunciation at the level of individual sounds rather than as a single number.

7. You answered "Not Given" from what you know

Reading and listening.

False means the passage contradicts the statement. Not Given means the passage does not address it. Candidates answer from world knowledge — the statement sounds wrong, so they put False.

Invisible because your reasoning felt sound. It was sound; it was just about reality rather than about the text.

The check: for every False, point at the line that contradicts it. If you cannot, it is Not Given.

8. You listened for the word that was never said

Listening.

The question says "library". The recording says "learning resource centre". Candidates listening for the keyword hear nothing and assume they missed it.

You do not notice this even in review, because when you read the transcript afterwards the paraphrase is obvious. In real time it was not.

The check: in review, do not ask "did I hear it". Ask "what words were used instead of the ones in the question".

The pattern

Every mistake above shares one property: you cannot catch it by re-reading your own work, because the thing that makes it invisible is that your answer makes sense to you.

That is why re-marking your own mocks plateaus. You confirm what you meant instead of seeing what you wrote.

What to do about it

The practical version is unglamorous: get your answers marked against the criteria separately, so the weak one is named rather than averaged away.

Hilingo gives you one full scored mock free, with no card. Writing comes back on all four band descriptors with a band each, rather than as one number — so you can see whether you are a 6 in task response and a 7 everywhere else. Speaking is assessed across Parts 1 to 3 on all four criteria, with pronunciation reported as its own band rather than folded into one speaking number, so you can see whether it is pronunciation or fluency holding the band down. Reading and listening answers come back with the reason each was wrong and the evidence sentence quoted, so a Not Given mistake shows you the line that decided it.

Take a free scored mock

• IELTS General Reading: your error budget — how many wrong answers you can afford
• The last week before your IELTS — what moves your band late
• IELTS band score chart — band to CLB per skill

Frequently asked questions

Why am I stuck at band 6.5 in IELTS?

Usually because one criterion is a band below the others and you have not identified which. An overall 6.5 is typically a 7 in three criteria and a 6 in one. Practising everything equally keeps the weak criterion weak; the fix is finding it and working only on that.

Which IELTS section do candidates lose the most marks in?

It varies by candidate, which is the point — the section you assume is your weakest often is not. Writing hides its losses best, because a fluent essay can still miss task response entirely, and that alone is a quarter of the mark.

Can I correct my own IELTS writing?

Partially. You can catch spelling, word count and grammatical slips. You cannot reliably catch task response drift, weak cohesion or limited grammatical range, because your own essay makes sense to you — you know what you meant, and the examiner only sees what you wrote.

Does my accent lower my IELTS speaking score?

No. Accent is not assessed; intelligibility is. Candidates who lose pronunciation marks usually lose them on a few specific sounds rather than across their whole speech, which is why "work on your accent" is unhelpful advice and identifying the specific sounds is not.

Is it bad to use linking words in IELTS writing?

Using them is fine; relying on them is not. Cohesion is whether your ideas follow from each other. A marker recognises mechanical linking as a pattern, and overuse can lower the coherence and cohesion score rather than raise it.