What I’d do is just practice LOADS of questions on that topic, not full past papers but only one topic. So for example, maybe try a momentum question, check the mark scheme then and write down the steps you took to do it. Then try another very similar question with your notes next to you. Then search up momentum question video and after every step up you do, check if the video does the same steps (then you can find out what step you miss out on). And then just search up momentum gcse questions and try every one, ONE BY ONE (so you don’t do all of them and realise you did them all wrong).
Do you struggle recalling the content questions too? Problem with phys is that you can’t just memorise it; you need to understand what you’re learning to succeed.
If there are any questions you’re struggling with let me know and maybe I can help (took WJEC gcse and got an A*, but I’m assuming the content will be very similar).
And let me know if this was helpful or if I misunderstood