tips on how to get A-A* in comp sci a level

what did u get in mocks?
identify ur weak areas then revise them hard. get a broad range of knowledge if you dont have enough time to get proper depth, this will help you with the smaller (1-4 mark) questions, which make up the majority of paper 1. for paper 2, program the key algorithms (graph traversal and sorting algorithms) so that you understand them.
im sitting OCR comp sci in a few weeks too

I got an A in Computer Science last year with an A* in the coursework. Best advice would be just to do as many questions as possible. I did OCR too, and they pretty much just recycle questions year in, year out.