Ik I'm late and you may or may not have already switched but there are a few things I want to point out here:
1) You're not really giving yourself more options by taking Biology and Psychology because you only take one science. If anything, Maths would be far more useful in giving yourself more options when it comes to STEM. The only extra option you're giving yourself is to study Psychology at Uni (fine if that's what you plan to do). You can't study Biology as you would need another science (such as Chemistry) or Maths.
2) Biology is a difficult A-level and it isn't easy to get high grades unless you revise a lot. Believe me, I took it in September because I enjoyed it at GCSE and wondered, why not take it at A-level? I was so wrong. I ended up completely hating the subject as it was so in-depth, boring and completely different to how it was at GCSE, not in a good way. Plus the mark scheme is crazy specific. I dropped it a month in, but that's me. Make sure you do some research into the subject so you don't end up regretting it!
3) I would recommend that you stick to your strengths. If Biology and/or sciences weren't your strengths at GCSE, you should think about switching. It'll be much harder and it needs much more work than your other subjects. If you're not enjoying English, why not switch to another essay-based subject that may be more interesting to you?
Did you end up switching? If so, how are you finding them so far?