I got a very high B in physics, 2 marks from an A, was my only B, but i got it due to getting complacent. Physics at AS level is significantly easier. Materials and waves (unit 2 for AQA) was by far the worst for me, despite actually getting an A in that module. The material in that unit is painfully boring and waves can be quite difficult. Mechanics was easy for me as i did M1 in maths last year. But dont worry, because the other unit is actually quite interesting, with particle physics and lots of maths, which is quite easy. If you want to do well with physics at AS level you simply have to learn it and get a lot of practise in.