I really really want to learn further maths in 6 months...

Considering that I am on a gap year, if I wanted how likely is it for me to be able to learn all the fm content (with the decision module) in 6 months
(this is less time then I would have ideally allocated but my circumstances got in the way)

I'm willing to dedicate 4-5 hours a day of intense study.. but would this be enough to get at least a A in the A-level?

Would it be better for me to just do AS further mathematics and sit the modules most relevant for computer science?

(im applying to computer science at universities that don't state fm as a requirement on their website apart from Bath where it is recommended but I really really want to get into Bath)

As I have already sat my A-level ill give a bit of context, 3A* in chem bio maths. and 999999888 gcse (8's in eng lit, lang and spanish)