On the higher tier, most students who reach grade 7 can already answer the routine questions. The jump to 8 and 9 comes from the last questions on each paper.
Collect the hard questions
Go through recent papers from your exam board and pull out the final five questions from each paper. These repeat the same ideas: proof, circle theorems, vectors, functions and harder algebra.
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Remember one of your papers is non-calculator, so practise arithmetic by hand too. (Daniel)
Write every step
Method marks carry you even when an answer slips. Examiners can only reward the working they can see.