You're sitting at the exam desk. Twenty minutes for Task 1. You skim the chart, your fingers hit the keyboard, and halfway through you realize you've made a mistake you can't undo.
Here's what happens to most students: they don't score above Band 6 in Task 1 because they can't write. They score below Band 6 because they describe data wrong. You lose marks for accuracy. You lose marks for precision. You lose marks for task response before grammar even comes into play.
This guide walks you through the exact data description mistakes that cost you points, with real examples from IELTS reports, and how to catch them before you submit. Many of these errors are invisible until you use a dedicated IELTS writing checker, which is why understanding them now matters.
Let's be direct: "around," "approximately," and "roughly" are red flags. They tell the examiner you didn't actually read the data carefully.
The chart shows 45% in 2015. Not "around 45%." Not "approximately 45%." It's 45%.
Weak: "The percentage of students studying STEM subjects was around 45% in 2015."
Strong: "In 2015, STEM subject enrollment reached 45% of the student population."
When do you actually use approximation language? Only when the data itself shows a range, or when you're comparing two numbers that are genuinely close. If the chart says 2.3 million and another shows 2.1 million, sure, you can say "roughly similar." But if it's a direct, clear number? Just use it.
The examiner checks your Task Response band descriptor, specifically looking for "accurate presentation of the main features." Vague language signals you didn't analyze the numbers accurately. That's a mark you can't get back.
Task 1 isn't a data dump. It's about finding trends, patterns, and relationships in what the numbers actually show.
Most Band 5 writers do this:
Weak: "In 2010, the figure was 23%. In 2011, it was 25%. In 2012, it was 28%. In 2013, it was 31%."
That's just listing. No understanding. Band 7+ writers do this:
Strong: "Between 2010 and 2013, the figure showed a consistent upward trend, rising from 23% to 31%, with an average increase of approximately 2.7% year-on-year."
See the difference? You're not just reporting data. You're interpreting it. You're showing the examiner that you understand what the numbers mean together, not just individually.
Tip: Ask yourself this: "If I removed all the numbers from my sentence, would it still show the trend?" If yes, you're interpreting. If no, you're listing.
This one kills your Grammatical Range and Accuracy score, and it shows up constantly in IELTS task 1 reports.
When you compare data, you need parallel structure. Same grammatical pattern, every time.
Weak: "Japan's exports increased by 12%, whereas Germany experienced a decline of 5%, and Italy remained stable."
Three clauses. Three different structures. It's awkward. Here's the fix:
Strong: "Japan's exports rose by 12%, Germany's fell by 5%, and Italy's remained stable."
Or even cleaner:
Strong: "Exports increased in Japan (12%), declined in Germany (5%), and remained unchanged in Italy."
Parallel structure shows you control the grammar. Band 7+ writers do this automatically when comparing multiple data points.
You've got 150-180 words. There's no space to describe every single data point.
Yet students try anyway. They cram in so much detail the main trend disappears. The examiner can't see the forest for the trees.
Weak: "The chart shows data from 2000 to 2020. In 2000, the figure was 10%. In 2005, it reached 18%. By 2010, it had climbed to 32%. In 2015, it stood at 45%. Finally, in 2020, it peaked at 52%. This demonstrates various changes throughout the period."
That's description without synthesis. Now look at this approach:
Strong: "Over the 20-year period from 2000 to 2020, the figure experienced a dramatic and sustained increase, more than quintupling from 10% to 52%. The steepest growth occurred between 2005 and 2015, when the proportion surged by 27 percentage points."
Which one shows you actually understand the data? The second one. You've identified the key pattern and highlighted the most important detail (when growth was steepest). You didn't bother with the yearly breakdown because it's not essential to understanding what the data is telling you.
The verb you choose matters. It's not decoration. It changes the meaning.
Don't say something "increased to 45%" when you mean it "increased by 45%." These mean completely different things.
Weak: "Sales increased to 20% in the first quarter."
Strong: "Sales reached 20% in the first quarter" or "Sales increased by 15 percentage points in the first quarter."
Here's your verb checklist for IELTS Task 1:
Tip: The IELTS band descriptor for Lexical Resource at Band 7 asks for "accurate spelling and punctuation on the whole" and "skillful use of lexis." Using the right verb is skillful. Using the wrong verb is inaccurate.
Not all data moves in one direction. Sometimes there's a dip. A flat period. A sudden spike.
Weak writers ignore these because they don't fit the main trend. Strong writers call them out because it shows deeper analysis.
Weak: "The number of tourists increased throughout the decade, reaching 5 million by 2020."
But what if the chart shows a 40% drop in 2008? You've just described the data inaccurately. The examiner notices immediately.
Strong: "Tourist numbers rose steadily throughout the decade, though a sharp 40% decline in 2008 interrupted this trend. Recovery was swift, and by 2020, visitors had reached 5 million, the highest level recorded."
Calling out anomalies doesn't weaken your response. It strengthens it. You're showing the examiner you've actually read the entire chart, not just skimmed the overall direction.
You might write grammatically correct sentences, but if they don't connect logically, you'll lose Coherence and Cohesion marks.
This is what disconnected writing looks like:
Weak: "Coffee consumption rose by 15%. Tea remained stable at 12 million units. Soft drinks experienced fluctuation. The market was competitive."
Each sentence exists by itself. There's no connection. Here's how to link them:
Strong: "While coffee consumption rose by 15%, tea remained comparatively stable at 12 million units. In contrast, soft drinks experienced significant fluctuation, suggesting greater market volatility in this category."
Notice the connectors: "while," "in contrast," "suggesting." These show relationships between the data points, not just the data itself.
Use these connectors in Task 1 when comparing data:
You lose Task Response marks when you describe a 2% change as "dramatic" or a 47% surge as "modest."
The examiner has the same chart. They know what 47% actually looks like on a graph.
Weak: "There was a slight fluctuation in sales, rising to 85% from 10% over five years."
That's not slight. That's a 75 percentage point increase. Here's the accurate version:
Strong: "Sales experienced a dramatic rise from 10% to 85% over five years, representing a 75 percentage point surge."
Match your adjectives to the actual magnitude. A rough guide:
This isn't about being fancy. It's about being accurate. Accuracy is what separates Band 6 from Band 7.
You've now seen seven major report writing errors. Catching all of them while you're under 20-minute pressure is nearly impossible.
After you finish your Task 1 report, paste it into an IELTS essay checker that gives you specific feedback on accuracy, task response, and grammatical range. You'll spot vague language, missed trends, and magnitude mismatches before the real exam.
If you're working on Task 1 formal letters instead of charts, our guide on formal letter tone walks through common writing mistakes that cost marks there too. For Task 2 essays, check out resources on IELTS essay topics and argumentation patterns.
Spot data description errors before the examiner does. Get instant band scores and detailed feedback on accuracy, task response, and grammatical range.
Check My Essay Free