Understand everything before you do past papers. Write down where you go wrong and work on fixing your mistakes (especially useful for maths!!).
For example, if I was studying for maths and I find that I often got polynomial questions wrong, I would see which aspect I got wrong and do exercises targeting that aspect (practise makes perfect!). Or if I was doing past papers for physics and I missed points about communication in waves, I would go over that part of the syllabus until I know it inside out.
Hope that helps
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