A-Level Further Maths worries!?!

I have selected to do further maths for as level but I wondering how intense is the work load, considering my modules are FP1-FP3 M2-M3 D1 on top of M1, S1 and C1-C4 for a level maths. I'm worried that doing a level further maths will distract me from my other subject which are biology, chemistry and normal maths. I end up wanting to study medicine at uni and don't want to have to spend more of my time at further maths than I would be spending on biology and chemistry, as these are the subjects that are essential. I will need high grades, so around 2A* and 2A in my A2's in order to do my desired uni course and so would I be better doing physics to help me achieve these grades? ANY ADVICE would be appreciated as I need to decide in 2 days or else it's unlikely I'll be able to change. thanks in advance

Hah, those are the exact same units that I took. Out of those units, I thought most were fine but three were very tough - FP2, FP3 and M3 - and FP3 in particular was grueling. The problem is that there isn't really any way of knowing for certain how difficult you'll find them when you've literally just started Year 12, so it's a very difficult thing to judge. How good would you say you are at Maths? If you're confident that you're a good Mathematician and you're finding C1 manageable then I think it's worth a go. If not, perhaps it is worth switching to Physics or just doing AS Further Maths (which isn't too hard in my view, only A2 Further Maths is monstrous). Honestly I don't know, it's an extremely difficult question to answer. Have you asked your teachers?