Hi I'm hoping to apply to medicine in October and for my A Levels I took Biology, Chemistry, Geography and English Literature. You do not need Maths unless you wish to apply to Cambridge, who prefer it. I personally want to apply to Oxford, an equally amazing uni, and their stance is the third/fourth subject does not matter and they actually appreciate students being well-rounded by studying subjects outside of the realm of science. I didn't take maths, but I understand from a lot of my friends that the initial jump in content is not much, but by the end of the year and into A2 it is very intense and that even exam questions on topics that seem easy when learning are hard. If you enjoy maths then definitely do it, but if you're worried about getting an A (stress is not enjoyable) I would perhaps consider taking a different subject, maybe physics if you're a very scientific person still (I started off doing physics rather than geography and the maths wasn't too intense in my experience) or other academic subjects, such as English, history, geography, languages or psychology. Hope this helps!