Originally published at englishaidol.com/blog. This version syndicated with permission.
TL;DR: After reviewing thousands of IELTS Writing samples, five specific mistakes account for most band-6 ceilings. Fix these and you'll typically see a 0.5-1.0 band improvement within 2-3 weeks. This guide shows you each mistake with real student examples, plus the exact correction.
If you're stuck at band 6.0 or 6.5 in IELTS Writing and cannot figure out why, this guide is for you. The frustrating truth is that most students who hit the band-6 ceiling are making the same 5 mistakes -- and no one ever tells them. Their vocabulary is good enough. Their grammar is good enough. But the examiner keeps marking them as band 6.
I am Alfie Lim, a TESOL-certified teacher and the founder of English AIdol, an AI-powered prep platform. Our AI writing grader is calibrated to the four official IELTS band descriptors (Task Achievement, Coherence & Cohesion, Lexical Resource, Grammatical Range & Accuracy) and predicts real examiner scores within 0.5 bands about 90% of the time. After reviewing writing samples from students in 80+ countries, these five mistakes are the ones that appear over and over at the band-6 level.
Fix them and you will almost certainly see a 0.5-1.0 band improvement within 2-3 weeks. No new vocabulary memorization required.
Mistake #1: You answer the question -- but not the WHOLE question
This is the biggest single reason students get capped at band 6 for Task Achievement (or Task Response for Task 2).
Example prompt:
Some people believe that studying abroad is essential for young adults. Others think it is unnecessary and expensive. Discuss both views and give your own opinion.
This prompt has three separate things you must do:
- Discuss view A (studying abroad is essential)
- Discuss view B (it is unnecessary and expensive)
- Give your own opinion
Most band-6 students discuss view A thoroughly, touch view B briefly, and never clearly state their own opinion. The examiner marks them as "addresses the task partially" -- that's a hard cap at band 6.
The fix: Before you start writing, circle every task in the prompt. For "discuss both views and give your own opinion," write three roman numerals on your scrap paper: I. View A, II. View B, III. My opinion. Your essay must have a paragraph (or at minimum a substantial section) covering each one.
For Task 2 prompts with two parts ("do you agree or disagree? Give reasons and examples"), students often give reasons but forget examples. The examiner is trained to look for both. Always include at least one specific example per main argument.
How to check your writing: Paste your essay into any AI grader that scores against the IELTS rubric (our free AI IELTS grader does this) and look specifically at the Task Achievement score. If it's flagging "partial task response," this is your issue.
Mistake #2: You paraphrase the prompt, then stop developing the idea
Here's a real student intro (anonymized) from a recent submission:
"In today's modern society, many people hold the view that studying abroad is essential for young adults. However, others believe it is expensive and unnecessary. This essay will discuss both sides and give my opinion."
This intro is technically fine. But the problem is what comes next. The student then writes:
"Those who support studying abroad argue that it is essential. This is because it provides many benefits. It helps young adults to grow and develop as individuals. Therefore, studying abroad is very beneficial."
Every sentence restates the same idea in slightly different words. There is no development. The examiner sees four sentences that say nothing more than the intro already said.
The fix: After your topic sentence, use this structure:
- Topic sentence -- state your point
- Explain sentence -- WHY is this true?
- Example sentence -- a concrete example, real or realistic
- Link sentence -- connect back to your argument or transition
Here's the same paragraph fixed:
"Those who support studying abroad argue that the experience develops skills classroom learning cannot teach. Living in a foreign culture forces students to solve problems independently, manage their own finances, and adapt to unfamiliar social norms. For example, a student from Vietnam who spends a year in Germany must navigate everything from finding housing to understanding local workplace culture -- skills that simply cannot be taught in a textbook. This real-world learning is what employers increasingly value over degree credentials alone."
Same topic, same word count, vastly different band score. The second version shows "development of position with relevant, extended and supported ideas" -- which is the language the examiner rubric uses for band 7+.
Mistake #3: You use "linking words" that don't actually link anything
This is the single most frustrating mistake because students are doing it to try to hit band 7. They read somewhere that "examiners love cohesive devices" and they start sprinkling "Moreover," "Furthermore," "In addition," "Nevertheless" at the start of every sentence.
The problem: these words don't link ideas unless the sentences actually have a logical relationship. Here's a real example:
"Many people study abroad. **Furthermore, university is expensive. **Moreover, some students work part-time. **In addition, cultural differences can be challenging."
There is no logical relationship between these four sentences. "Furthermore" means "adding another point in the same direction" -- but these sentences aren't in the same direction. They're completely different topics. The examiner reads this and marks it as "mechanical" use of cohesive devices, which caps Coherence & Cohesion at band 6.
The fix: Only use a linking word if you can explain in plain English why it's there.
- "However" → the next sentence contradicts the previous one
- "Therefore" → the next sentence is a consequence of the previous one
- "For example" → the next sentence illustrates the previous one
- "Moreover" → the next sentence adds MORE evidence for the same point
- "Nevertheless" → the next sentence acknowledges a contradiction but maintains the original position
If you can't explain it, delete it. Band 7 students use FEWER linking words but use them correctly. Band 6 students use many linking words but use them mechanically.
Mistake #4: Your vocabulary is "impressive" but wrong
Band 6 students often memorize lists of "high-level" IELTS vocabulary -- "utilize," "ameliorate," "plethora," "exacerbate" -- and try to shoehorn them into every essay. The problem: native speakers rarely use these words in this context, and the examiner knows it.
Real examples from student writing:
- ❌ "The government should ameliorate the education system." (should improve)
- ❌ "There are a plethora of reasons why people utilize this method." (should be "many reasons why people use")
- ❌ "Various factors exacerbate the situation." (acceptable in academic English, but the student meant "make worse" -- "make worse" would be fine and more natural)
The Lexical Resource band descriptor for band 7 specifically says: "uses a sufficient range of vocabulary to allow some flexibility and precision." Precision is the key word. Using a fancy word imprecisely is WORSE than using a simple word correctly.
The fix: For the next week, write practice essays using only common English words. Focus on being precise, not impressive. Then, slowly introduce academic vocabulary only in places where it adds precision (for example, "ameliorate" is great in "ameliorate chronic symptoms" because it specifically means "to make a bad situation less severe" -- but it's wrong in "ameliorate the education system" because you just mean "improve").
Our AI grader specifically flags "vocabulary imprecision" as a separate criterion -- if you see that warning, this is your issue.
Mistake #5: Your conclusion is a rephrased introduction
This is the easiest mistake to fix and the one students make most. They spend most of their 40 minutes writing body paragraphs, then hit the 35-minute mark, panic, and write:
"In conclusion, as I discussed above, studying abroad has both advantages and disadvantages. Overall, I believe it is beneficial."
This is called a "rephrased introduction" and examiners are trained to spot it instantly. The band descriptor for Coherence & Cohesion at band 7 says: "presents a clear central topic within each paragraph." Your conclusion should present a new thought -- a synthesis, a broader implication, or a concrete recommendation.
The fix: Your conclusion should answer: "So what?" Why does this matter? What's the broader implication?
Here's a band-7 conclusion for the studying-abroad prompt:
"While studying abroad offers transformative personal and professional development, the financial barrier means it remains accessible mainly to students from wealthy families. If governments and universities are serious about the benefits of international education, they should expand scholarship programs and partner exchange agreements -- otherwise, studying abroad will remain a privilege, not an opportunity."
Notice what this conclusion does: it acknowledges both sides (one of the original task requirements), states a position clearly, AND adds a broader thought (a specific recommendation for governments and universities). This is what "clear central topic" means at band 7.
The 2-week fix plan
If you have two weeks before your IELTS test and you're currently at band 6, here's the plan:
Days 1-3: Pick 3 old practice prompts and rewrite your old essays using the fixes above. Don't write new essays yet -- just fix your old ones.
Days 4-10: Write 1 full essay per day (alternating Task 1 and Task 2). Use a checklist:
- [ ] Did I address EVERY part of the task?
- [ ] Does every paragraph have development (topic → explain → example → link)?
- [ ] Did I use linking words only when there's a real logical connection?
- [ ] Did I prioritize precision over impressive vocabulary?
- [ ] Does my conclusion add a new thought?
Days 11-13: Take two full timed practice tests. Review each essay against the checklist.
Day 14: Rest. No writing the day before your test.
Get your writing scored for free
The fastest way to find out which of these 5 mistakes YOU are making is to submit a practice essay to a grader that flags them specifically. Our free AI IELTS writing grader scores against the four official criteria in 10 seconds and flags each of the mistakes above by name. You can use it without signing up for your first essay.
We built it specifically because these 5 mistakes are so common and so fixable -- but students rarely know which one is capping them until someone points it out.
Questions about your own writing? Comment below with a paragraph from your practice essay (anonymize any personal details) and I'll give you specific feedback on which of these 5 mistakes it contains.
If this guide helped you, please share it with a friend who is stuck at band 6. These mistakes are universal -- I see them from students in Vietnam, India, China, Brazil, the Philippines, and every other major IELTS market.
Alfie Lim is a TESOL-certified English teacher and the founder of English AIdol, a free AI-powered English test preparation platform. The platform's AI writing grader is calibrated to the official IELTS band descriptors and predicts examiner scores within 0.5 bands approximately 90% of the time.
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