What math modules are the best for prerequisite knowledge for a uni course in CS?Watch
Note: I've already done C1 - C4.
All the calculus, infinite series, and differential equations CAN be relevant, depending somewhat on the "flavour" of the course - for more computer engineering style courses with more content on electronics and signal processing, this is essential. These areas underpin contemporary computer science anyway though so, still relevant. As above, you'll probably cover more or less of this in most uni courses anyway - at least the core single variable calculus and infinite series stuff.
I'd say overall the Further Pure options are perhaps more generally useful, and particularly for more theoretical/academic courses (which the "top" courses tend to be). The discrete/decision content is still reasonably relevant, and increasingly more so for more "applied" areas/courses including in e.g. computational physics, financial computing, software engineering, bioinformatics etc. So...your mileage may vary. In general terms, as above, I think the FP options are at least nominally better preparation for a CS degree. That said a lot of the FP content can be a lot less relevant, like hyperbolic functions, conic sections and so on...but the mathematical thinking is still useful to experience I suppose.