Yeah i think you should drop one probably, you only need three subjects for unis and your grades in bio and chem are a bit lower.
What do you want to do at uni or as a career?
If you prefer biology then take it, maybe look through the specs to see if the topics appeal to you more 🙂 It’s not true that you cant do anything with bio if you dont have chem. You’ll have a lot of options with these subjects in STEM fields- maybe browse some degrees on a site like uniguide and check the uni specific subject requirements (if you’re using uniguide dont trust the subjects they tell you are required!).
Ive just started a levels in Maths, Physics and Biology. In the future i plan to go into ecology or zoology related fields- chem isnt needed for this. Also in my biology class, there are like 12 of us and only two do chem as well.
Hope this helps and best of luck with your decision!