Hi!
I did the OCR A Physics A-Level (no maths) and received an A, when at the beginning of year 13 I was at a C! The best advice on how to pick up physics quick is to go back to the basics all the time, AKA the entirety of year 12. By this I mean for one, memorise all the exam board given definitions with flash cards as easy marks can be picked up here, and all the laws like Newton’s and Kirchhoff’s. If you struggle with electricity like I did, then it’s best to get a better understanding of things like the difference between EMF+potential difference, and current, past the fact it is the rate of flow of charge carriers and think of it as electrons oscillating about their fixed positions, and each change of direction of the electrons is where the current also changes direction (AC current). This goes for potential dividers and their relationship with NTC thermistors and LDRs. Lastly I would go and look at all the the 6 mark questions (may not be necessary if you’re doing, say, AQA) and read the mark schemes. Each paper should have at least one long answer question on a practical. They often want an equipment list and for a graph to be drawn to represent an equation you may be given or expected to produce. Always say to draw a best line of fit and find the gradient, explaining what the value means, then draw a worst line of best fit and show the percentage discrepancy of that gradient to the first one- this shows the amount of error your investigations has produced and how precise your values are.
As you do maths as well, this should help your understanding of 2D vectors as it is a large part of the maths of physics, so revise those too. Don’t hesitate to ask me questions about physics!