A level help

Ok so my enrolment meeting is in a few hours and I have an opportunity to change my A level subjects. The subjects I have chosen are
Biology
Chemistry
Maths
English Lit

I'm happy with them all apart from maths, I got an A in it at GCSE however I really don't think I'll enjoy maths or do that well in it. I haven't decided what career I want to do but I'm torn between medicine and law. If I do maths it will only be as an AS anyway so is it worth keeping it as it's a respectful subject by universities or should I do something I'd enjoy more like politics?