I did bio and chem. I got a 7 in chem for my GCSE’s and I didn’t really enjoy it at GCSE. I actually found it alright at AS/A level, if you know the basics you’ll do fine. Especially if you got a 9-8. I’d advise watching some YouTube videos or looking at the specification to see if you’ll like it because it goes into more depth than GCSE. Biology was good too, if you like essay writing you’ll likely enjoy it but the mark scheme was very picky so you might need to do exam practice and familiarise yourself with the mark scheme. I also did English literature. Tbh for me, these subjects were very similar to GCSE just more detailed or different books etc