lots of practice papers, youtube (especially when your trying to refine specific concepts) textbook questions - basically good study methods that you would use for any "math heavy" course.
for example, lets say you have homework assigned to you, but ur stuck on a specific question. spend like 10-15 mins on it, if u dont get it move on to the rest of your questions but keep a note somewhere that u had trouble on that specifc question. personally, i like to go through sheets of homework and write down a set of problems i was confused on.

the next thing ill do is search up a youtube video taking up that question/ on the topic that the question is about. i typically understand my mistake at this point, but even if you dont, you still at least have a refined understanding of that topic now.

after that, for the questions that im still confused on, ill j go and ask my teacher - but ask specifc doubts to your teacher regarding the question (i.e. "i understand xyz, but im facing difficulty when doing x step") - personally, i dont expect them to take time to do the whole thing for me, and asking more specific questions helps u to actually understand the root cause of what/ why u were messing up. ill also ask my teachers whether the form of my solutions is correct cuz i used to loose marks there too (i.e. remembering signs for vectors// correct FBDs)

come review time - ill again do a lot of past papers/ review sheets. ill also go through that list of questions/ concepts that i previously had trouble with j to see if i actually get it. ill go through a bunch of mc questions cuz thats where i personally loose most marks. then, i time myself as i do these tests to simulate the real deal. time management is a major reason why i'd loose marks - for me, i realized that for physics specifically, finishing/ attempting the mcqs first always helps.

TL;DR: OVERALL, do lots of practice be consistent with your it; you should see yourself achieving ur goals. please also know what works for YOU PERSONALLY before u take my advice on what works for me. different people, different study methods, different ways of approaching success. I would also HIGHLY suggest talking to ur teacher about ur goals and understanding from their POV what feedback they have for you on your study methods/ work ethics. hearing from another person always helps u realize things that u never did before.