Which are the best options to study after B.Sc in maths?

In our life, in our whole world mathematics is known as the universal subject. You can do each and everything in study with mathematics by some extra effort. As plant growth depends on the specific root similarly means growth totally based on mathematics. Without mathematics he/she can't do anything

You can do M.Sc in the same course, and apply for the post of professor. It is a good scope. Else, you may wish to choose actuarial Science subjects, if interested.