Data Grouping Error in IELTS Task 1

Task 1 · Grouping · May 2026

Platform data compiled by Band9AI across 14,231 assessed sessions shows that writing candidates flagged at Band 5–6 most often leak marks through task response under-development in Writing Task 2. Verification methodology

Last updated (factual triplet change): 2026-06-30

Direct answer

The data-grouping error trap is when your report lists accurate figures in the wrong clusters. You jump from 2010 sales to 2015 profits to 2012 exports in one paragraph. Examiners read for logical overview and grouped detail, scattered series feel like a data dump, not a report. Task Achievement drops even when numbers are right.

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How the trap shows up

Year hop 2010 then 2015 then 2012 in one block

Category mix Sales and demographics combined

Unit clash Percentages beside raw counts unlabelled

Grouping traps that cap Task Achievement

Trap	Why it fails
Chronological scatter	No overview thread
Compare unlike series	Country A vs global total
Mini-lists	Every figure, no grouping
Overview missing	Facts correct, structure wrong

Contrast with data selection traps.

Fix: one grouping rule per paragraph

Overview names the main split (by time or by category). Body 1 follows that rule; body 2 continues it. Never introduce a third grouping logic mid-report.

Key takeaways

Pick one grouping principle and apply it consistently.
Overview must preview how paragraphs are organised.
Do not mix years, categories, and units in one block.
Accurate figures in wrong groups still lose marks.

FAQ

Group by time period, category, or comparison pair, pick one logic and stick to it.

Yes when the chart has only two series, otherwise split paragraphs.

Selection is what to include; grouping is how you organise what you include.

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Check whether your Task 1 paragraphs follow one clear grouping logic.

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