Further Maths Watch
You can not go from GCSE maths to further maths without first studying AS level maths at least.
And thats stuff that you are likely to learn in C3 and C4 ie next year in normal maths, so you need to be careful which modules you take, if you get a choice!!
I didnt get a choice which meant that we had to have a 2 week crash course in all c3+c4 calculus in order to complete M2