Matching headings asks you to pick the main idea of a paragraph, not a detail inside it. The list is longer than the number of paragraphs, so unused headings are a trap, not a leftover you must force in. Read the heading list once. Then read one paragraph and ask what the whole paragraph is doing — a cause, a change, a problem, a result — before you look back at the list. Detail headings often copy a noun from one sentence; the right heading usually names the job of the paragraph. If two headings both seem possible, keep the one that covers the start and the end, not only the example. Do not reread every paragraph three times; the paper is 60 minutes. Practice IELTS is Writing and Reading only. Scores are practice estimates, not official bands.
Take 1 free scored test (Writing or Reading) at https://practice-ielts.com. Then $14.99 for 3 months of Writing + Reading. Not official IELTS.