I took maths, further maths, chemistry and physics at AS and am moving onto A2 next year. I would 100% reccomend physics, it may be slightly harder then chemistry, but its so much more interesting to me personally, plus a lot less facts to remember. I think taking maths with physics is probably a good idea as quite a lot of it is about equations and stuff. AS maths isnt really too hard, C1 is pretty much GCSE but slightly harder problems and C2 you get a calculator! S1 is kinda boring but just putting numbers into equations so relatively easy, and gives a base for understanding interesting problems in S2