What should I do in the last two minutes?

Check three things, in this order. First, words and figures: every number you quoted must exist in the visual, and the answer must reach at least 150 words. Second, structure: each body paragraph should open with a comparison rather than a label, and there should be no bullet points anywhere in the answer. Third, the overview: read it on its own and ask whether it would still be true if the figures were different. If it would, it is too general to be useful.

IELTS Writing Task 1: When the Task Gives You Two Charts →