I do highers in Scotland and i'm currently doing English, Maths, Geography, Physics and Chemistry.
I have spoken to a few pilots most of them edging towards 'simply going for it' and trying to get a place on a course however, i'm still thinking long and hard also discussing with the parents the financial side of things so i'm mostly concentrating on school at the moment and simply in the 'planning stages of flying'.
I do recommend the subjects you're looking at taking so you are on the right track.