good at math you say: finance, banking(not banking), accounting, engineering.
CPA's work in private practice but also in management. companies tend to hire CPA's from "good" firms into their upper management (with some experience of course) big six + "right work experience" = upper management and big $$.
CPA's also do consulting, mergers, compliance, FP&A, auditing etc. (good $)
Don't rule out the consultant world. If "it" is difficult to understand, thats the beauty of it. If someone NEEDS "it" really badly, they have to pay you to do "it" for them. (thats what I do... "it", don't ask) Almost all companies hire outside consultants.
Do a summer internship but keep the non-paid portion to a minimum (i.e. once) Try to intern in a big, prestigious company. Looks good on the resume.
Sales?... something that you can sell a lot of and has a big commission. its difficult but technology sales are lucrative.
BTW good shark lawyers make TONS of money. But i would feel dirty doing that. but afterall it is $