+1 to both the above.
There's no getting around the fact that you need to be proficient enough to get to whatever level needed pass the ATPLs, i.e. whatever equate to an O level these days/where you are. You'll almost certainly need to hang to to some of that proficiency to pass any selection tests prospective employers might throw at you further down the line, and their questions might not be in the banks so a bit of understanding of basic maths/ very basic physics might be handy.
Beyond that as parkfell said "Enjoying mental arithmetic and sums generally is important."