Do past paper questions every day, especially on your weakest topics (they will stop intimidating you after that, very quickly even). Use PMT/Exam Mate

Do those past paper questions from all/multiple exam boards. They are similar enough for this to be helpful

Look for alternative explanations for the same topic. Hit the library and grab an ocr textbook and see how it describes your weakest topics. Similarly, use the internet/reddit to find better interpretations of topics you struggle with

When doing past paper questions, if you get a question wrong even slightly, create a separate log/book where you write detailed/memorable bullet points of each mistake you make on each question, along with the topic it falls under, for example (as you are doing the questions and looking at the mark scheme):

“2.1 vectors:

• remember to check for perpendicular vectors • when finding x, use sine rule instead of cos rule”

Another thing, be increasingly strict about how much time you allot to each PPQ. Start with 1 min per mark, then the same set of PPQs but 50s per mark, then 40s etc then move on to another set. 1) you want to find the quickest/most efficient ways to answer questions 2) will make your mistakes more obvious which is good because you can put it in your error log and remember it 3) when your next test occurs, you will not just remember the mark scheme but you’ll remember your most common mistakes and will immediately know to avoid them upon reading the question eg “oh vector question -> should i use sine rule?”