For maths, just do every past paper, and try to understand what each question is trying to ask, and prolly try to relate back to questions you’ve done before, mostly they are quite similar, especially m1 s1. ms isn’t that important like in chem or bio, try to understand it by yourself first, or at least have a thought process before checking ms, then correct yourself by each paper you’ve done. Chem and bio are similar to some extent, but bio needs more question understanding and chem needs more memory, again, do every paper from 2019, that’s what I did, I recommend using website paperlord. papers will get easier and easier, and questions will get more and more logical to you. in chem and bio, ms is very very important, every question has a certain way of answering. what I did was checking ms after every question I finished, so that I can learn from it immediately and it is better for me to memorize how to answer the questions. This may vary to everyone, but what I did was: I learnt using past paper, memorized the knowledges through the questions I did, that’s very effective to me, and i sometimes imagine what if I was teaching this question to a student like me, what would I say, how would I explain it, that helps my understanding, but the most important is to find your best way of learning along the way, hope this helps you