Which course should I opt in post graduation after completing my graduation in mathematics?

If your family condition is good and you have good academic background, then must go for MBA in finance, otherwise go for M.Sc.

Hi, Being honest with you if your aim to earn 'Lots of Money' only then Graduation in Mathematics probably can't help you out. But, if you love mathematics and want to do higher studies with Maths then you will get a good job indeed.