Matching information asks which paragraph contains a specific detail — a number, a reason, a name — not the main idea of the paragraph. That is why it is not matching headings. Read the item, find a unique key (a year, a cause, a who), then scan for that key. A paragraph can answer more than one item. The same noun in two paragraphs is not enough; the sentence must actually contain the information. Do not reread every paragraph from the top for each item; the paper is about 60 minutes. Unused paragraphs are normal. Practice IELTS is Writing and Reading only. A Reading mark here is a practice score, not an official band.
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.