Hi Neha,
M.Sc. Mathematics is a two year course which comprises of four semesters the tution fees for College ranged from INR 30000 - INR 50000 the average salary after once completes the course ranges from INR 100000 - INR 400000 which will increase once you gain some experiences
Eligibility criteria for most of the colleges is that the candidate must have obtained atleast 50% aggregate in his graduation in same discipline.
One can also go further in research if one wants to by pursuing M.Phil. or P.Hd.
Hope it helps :)