Struggling to study physics?!?!?!? Edexcel A Level Physics

I'm in year 12 doing Maths, Physics and Econ, currently on an AAA predicted (can't get A* rpedicted in Year 12 at our school) but I think that A predicted in Physics is fraudulent, I am massively struggling and I really need to do well on the mock that is in a month's time. Does anyone have any tips to learn and revise the content? Need recommendations for youtube channels that go through topics well. Also, what's your guys' process of revision? Past papers, videos, flashcards etc?