A Level physics studies

Hi, use the spec to ensure you cover everything, and invest in a good textbook (e.g. CGP) or use A Level Physics youtube videos. Ensure you do lots of questions. The reason why self-studying an A Level (which I take you're doing) tends to be unsuccessful compared to taking one in school is that, at home, you'll have a lot less discipline and won't review content/test yourself regularly. If you think about it, at school you'd get set unit tests, mocks and homework, so ensure you are forcing yourself to stick to a rigid schedule, plan your learning out so you cover everything in time, and regularly review the content.
Good luck!