Forget the above comment. A level Maths is only hard if you think its hard (its physiological). But A level fm is hard so maybe dont do fm.
I got a grade 6 at GCSE maths 2 years ago, and I just a grade A in A level maths yesterday. I swear down that you wont regret taking A level maths, it will make you smarter in every day life, it improves your problem solving abilities, it looks great on applications, it opens more doors (metaphorical).