Great results bravo!
Biology and chemistry, and PE because i picked that too, were recommended sciences for me to take when I said i was interested in psychology, so a range of psychology related careers were open to you. In fact i found out i preferred the sciences to psychology after a few weeks. I better say i now study maths physics and chem, switching from maths pe chem and biology (this one was very interesting though).
looking at the brain for example is a science in itself, uses areas of science from the computer (the stuff you need to do with a computer to see results and learn more about the brain is one of the most in depth research areas, for example), to thinking of new, and developing tests for the participants/patients. Chemistry and Biochemistry, and even topics from medical physics are the main topics i'd recommend to look into. The psychol syllabus covers biology topics though, taking biol may help but the important thing is that you're less likely to miss out on all biol stuff.
I will let people who took psychology and biology tell you more about them though
Don't worry about having a mix of science and art/humanities subjects.
If you have an idea about what you wanna do at uni, look at what they require. Sounds obvious but any other subjects you do can be anything then-what you enjoy/what you simply want to improve skills in.
E.g if i applied for a science degree like chemistry I'm not at any disadvantage wehether i took english/histroy/psycol/business/theater studies/PE or not. Psychlogy A level will give you plenty of skills of writing, you don't need another written subject unless you like them. Same with applying for english or history.
Not sure how much you like maths, it's quite different at AS the topics are mostly new but get to grips with algebra. I enjoyed it much more than GCSE. Sciences are definitely better than GCSE. I found physics so boring but it's now probably my favourite. The maths you use in chem and physics are formulas like before, algebra can help though, it depends how you like to approach the problems really.
Finally, your choice isn't crazy, I'm not an expert but i commented on this because you mentioned you'd like a range, which is what i learned too late and thought i'd offer some advice from my experience aha. I changed my honest preferences from biology related subjects to more physical sciences because i gave them a chance from wanting a range. Well done for deciding to do this aha.
I don't really know what subjects you like more, any q.s about any of them/AS i'd be more than happy to help.
Sorry if this hasn't helped you AT ALL though, i guess i 've bumped the thread anyways
Good luck and enjoy whatever you do! Whatever they are, work hard at them from the beginning and you'll be surprised the lack of relationship between what you liked/were good at before and after studying AS. Which means you have great chance at improving in something you thought you weren't able to do, and have more options than you thought evern if you preferences and ability are in the same sort of subjects as before. That's really good.
Apologies this wasn't meant to be an essay.