I've marked thousands of IELTS essays. Thousands. And you know what I've noticed? Students aren't failing because they don't know English. They're failing because they make the same ten mistakes over and over again. Mistakes that are completely fixable. These common IELTS errors cost them between 0.5 and 1.5 band points each. And here's the painful part: most students never even realize they're making them.
Let me be blunt. If you're aiming for band 7 or higher, you can't afford to make more than two or three of these IELTS band score mistakes in a single essay. The IELTS band descriptors don't care about your effort. They only care about what's on the page.
I'm going to walk you through each one, show you exactly why it costs you marks, and give you the fix. No fluff. Just what you need to know.
This is where most students mess up on Task 1. They think their job is to describe everything in the chart, graph, or table. Wrong. Your job is to identify the key patterns and trends, then describe only those.
Last week, I saw an essay about a bar chart showing coffee production in five countries. The student wrote 280 words. The task asks for 150 words minimum. This student spent 130 extra words describing minor details instead of identifying that Brazil and Vietnam dominated global production.
Weak: "In 2010, Brazil produced 3.5 million tonnes. In 2015, it produced 3.8 million tonnes. In 2020, it produced 4.1 million tonnes. Vietnam produced 1.2 million tonnes in 2010..."
Better: "Brazil and Vietnam were clearly the dominant producers throughout the period, with Brazil's output rising from 3.5 to 4.1 million tonnes, while Vietnam's production nearly tripled from 1.2 to 3.4 million tonnes."
See the difference? The second version shows you understand the data. The first one just lists numbers.
Quick fix: Spend your first 2-3 minutes identifying the main message. What's the biggest trend? What stands out? That goes in your overview. Everything else is supporting detail.
This sounds obvious. You'd think everyone reads the question carefully. They don't.
I watched a student get this prompt: "Some people think children should start school at age 4. Others think they should start at age 6. Discuss both views and give your own opinion." They then wrote a beautiful essay about why early education is beneficial. They never discussed the opposing view. They got a Band 5 on Task Response because they only answered part of the question.
The IELTS band descriptors are crystal clear about this. To get Band 7, you need to "address all parts of the task." To get Band 8, you need to address them "fully." That's the difference between the band scores.
Quick fix: Underline every instruction in the question with different colors. One for what you need to discuss. Another for what opinion you need to give. Then check your essay against each color. Did you cover everything?
Here's something I see all the time: a student wants Band 8, so they start using words like "proliferate," "ameliorate," and "juxtapose" in every paragraph. Then they use them incorrectly. It's immediately obvious they learned these words from a list, not from reading.
Last month, a student wrote: "The government should juxtapose new housing policies." No. You juxtapose two things to compare them. You don't juxtapose a policy. This mistake made the marker question whether the student actually knew what they were writing.
Here's the truth: Band 7 doesn't require fancy words. It requires accurate words. Band 8 requires vocabulary that's precise, natural, and sophisticated. Not showing off. There's a massive difference between sounding educated and actually being educated on the page.
Weak: "The proliferation of digital technology has ameliorated the societal landscape in multifaceted ways."
Better: "Digital technology has transformed how people work, learn, and communicate, creating both opportunities and challenges."
The second sentence is clearer, more natural, and actually says something. The first sounds like it was written by a thesaurus.
This kills your Grammatical Range and Accuracy score. Every paragraph follows the same pattern: topic sentence, supporting sentence one, supporting sentence two, concluding sentence. Every single paragraph looks identical.
Your reader sees this and thinks you're stuck at one level of English. You're not demonstrating range. You're demonstrating a template.
Weak: "Technology is important. It helps people work. It helps people communicate. It also helps people learn. Therefore, technology is very important."
Better: "Technology has become integral to modern life. Beyond its practical applications in work and communication, it fundamentally shapes how people develop new skills and adapt to changing environments. This transformation, while creating opportunity, also raises questions about over-reliance on digital tools."
The second example uses complex sentences, subordination, and different structural patterns. That's what examiners want to see.
Quick fix: In your next practice essay, count how many sentences use the same structure. If more than 40% follow the same pattern, rewrite. Mix simple sentences with complex ones. Use passive voice occasionally. Use dependent clauses. Vary your length.
IELTS writing requires formal or semi-formal register throughout. Most students get this wrong.
One student wrote: "Lots of people think that school uniforms are a bad idea, which I totally get." The marker noted "register not consistently formal." That's a Lexical Resource penalty. They used "a bad idea" instead of "disadvantageous." They used "lots of" instead of "many." They used "totally" instead of just stating the fact.
Weak: "Social media is everywhere these days. People can't seem to live without it. That's pretty cool in some ways, but it's also got some serious downsides."
Better: "Social media has become ubiquitous in contemporary society. While it offers significant benefits for connectivity and information sharing, it also presents substantial challenges regarding mental health and privacy."
Use "the government has decided" not "the government is gonna." Use "many people believe" not "lots of folks think." This matters more than you think. You can keep contractions (don't, won't, can't), but avoid slang and casual phrasing.
You can have brilliant ideas, but if they don't connect to each other, you lose marks in Coherence and Cohesion. A student writes a paragraph about environmental pollution, then the next paragraph jumps to education technology. There's no bridge. There's no reason they're together.
Good writing flows. Ideas build on each other. You can trace the author's thinking from start to finish. That's coherence.
It's not just about using linking words. It's about having a logical progression of thought. When you're working on discussing both sides of an argument or building a case for your own position, each paragraph needs to advance that case.
Quick fix: After you finish writing, read just the first sentence of each paragraph in order. Do they tell a story? Do they build an argument? If you're confused, your reader will be too. Rewrite your topic sentences so someone can understand your entire essay just by reading them.
Your introduction and conclusion are read with the most attention. Markers expect them to be flawless. When they're not, you lose credibility immediately.
I had a student who wrote: "In the following essay, I am going to discusses the reasons why social media is beneficial." Subject-verb disagreement right in the opening. Band 6 penalty on Grammatical Range and Accuracy before they even read the body paragraphs.
Another student ended with: "In conclusion, there are many problems that society must solve, like pollution, crime, and education which needs to be addressed." The "which" reference is ambiguous. Does it refer to one noun or all of them? This kind of error in your closing makes the examiner doubt your grammar control.
Quick fix: Spend 5 minutes at the end of every practice essay editing only your introduction and conclusion. Read them aloud. Does every sentence sound grammatically correct? If you're not 100% sure, simplify it.
The task says "at least 150 words." It doesn't say "write as much as possible." But students treat it like a word count competition.
I see essays that are 320 words when 250 words would be more effective. Those extra 70 words aren't demonstrating more knowledge. They're just repeating ideas. They're padding. And markers absolutely notice.
For Task 2, aim for 280-320 words. That's plenty to develop three solid points with examples. More than that, and you're likely repeating yourself. For Task 1, aim for 150-200 words. The task is to summarize, not to provide every detail.
Quick fix: After finishing a practice essay, read through it and delete one sentence per paragraph without losing meaning. Can you do it? If yes, you had unnecessary padding. If no, your writing was appropriately concise.
This destroys Coherence and Cohesion scores. You write about education policy, then use "it" or "they" and the marker has to guess what you're referring to. When it's ambiguous, you lose marks.
Example: "Schools implement new technology because students need it. It helps them stay engaged. They believe this is the future." What does "it" refer to in the second sentence? Technology? Schools? New policy? The sentence doesn't make it obvious.
Another student wrote: "The government has invested in new hospitals. They are modern and well-equipped." Does "they" refer to hospitals or the government? It's unclear.
Better: "The government has invested in new hospitals, which are modern and well-equipped." Now it's clear that "which" refers to hospitals.
When you use pronouns, make sure what you're referring to is obvious. If you're not sure, use the noun again instead of a pronoun.
Band 7 allows for a few minor errors. Band 8 requires very few. Most students lose 2-3 band points on Grammatical Range and Accuracy because of careless spelling or punctuation mistakes that were easily preventable.
I'm not talking about complex grammar errors. I'm talking about spelling "definitely" as "definately." Writing "there" instead of "their." Missing apostrophes in contractions. These mistakes are pure carelessness.
Quick fix: Spend the last 3 minutes of every practice test reading your essay one sentence at a time, slowly, looking only for spelling and punctuation. Not meaning. Not structure. Just correctness. Most students skip this step and lose easy marks.
These ten mistakes aren't difficult to fix once you know what to look for. The difference between a Band 6 and a Band 7 essay often comes down to eliminating these specific errors. Start with the ones that appear most in your own writing. Work on one or two at a time rather than trying to overhaul everything at once.
Want to know exactly where you're losing marks? Use our free essay grading tool to get feedback on your IELTS academic writing. You'll see which band score mistakes you're actually making, not just the ones you think you might be making.
You can also use our band score calculator to understand how errors in different criteria affect your overall result. Then focus your practice on the areas that will have the