Didn't read the whole thread, so sorry if i'm repeating someone
Don't do maths at A level if you struggle with it. Seriously, it's gonna be hard, loads of people in my year failed AS maths or got lower grades than expected because they were overestimating themselves. I'm not trying to scare you but think about it carefully, maybe talk to your teacher, ask for advice?
Wouldn't it better to get an A in something you like than a B in something you don't?
As long as you do 2 sciences, you should be fine. Have you considered doing physics instead maybe?
I personally wouldn't do something i dislike as there is a chance i wouldn't have the motivation. However, you know yourself best. You know what you're capable of. At the end of the day, it's up to you, so choose what you enjoy and what you're good at
Btw, your french, as far as i know, wouldn't count for medicine (or some unis) as an academic requirement because the exam wasn't sat within 2 years of A levels
Good luck
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