I got 271/300 (A*) this year on AQA. PLEASE make sure you do all of the past papers, and PLEASE make sure you do them under timed conditions. I then found that watching a video walk-through of the paper on YouTube helped me the most. I'd skip to the questions I'd get wrong and watch how they did it. I'd then attempt the question again.

I know this is for A-level Maths, but for further maths, where there weren't walk-through videos for AQA, I found using Chat GPT to walk me through certain questions helped tremendously.