Alternative to certain A-Levels?

Hey, hi, hello.

So, I've nearly finished my GCSEs and will either be going to sixth form or college the coming September. Just to clear it up, I am definitely doing A levels next year, I'm just wondering if there's anything else I can do in the meantime because there's only so many I can pick.

I've got a pretty good idea of the A-Levels I want to take (Biology, Chemistry, Psychology) but I'm kinda torn between doing Maths or Physics or something completely different like English Lit for my 4th. Of course, I can't take 6 A Levels, and even 5 is strongly advised against so I'm just wondering if anyone knows if there's anything outside of A Levels/school that could be equivalent or near enough to doing an A Level in one of those three subjects (English Lit, Maths, Physics). Like maybe an online course or something? I don't know.

Thank you.