I do chemistry, which I find the easiest science at a-level. Just finished my as levels, and thinking of picking up as physics in year13. Physics IS in the top 3 hardest with maths and Chem, an if you don't like maths then really is physics for you? Plus from what I've heard, there's nothing concerning 'space' topics in a level (as anyway) it's more mechanics electricity and particle physics etc..