Thanks for the question. 

These are very good options for B. SC mathematics - 

M.Sc/Ph.D: One of the best higher studies option available for the B.Sc Mathematics graduate is to do Master’s Degree in Mathematics followed by Ph.D or M.Phil

MCA: Master of Computer Application (MCA)

MBA: Master of Business Administration (MBA

UPSC every year for recruiting these graduates to several posts. Some of those exams are given below

Tax Assistant exam

Statistical Investigator exam

Grade III & Compiler Exam

Combined Graduate Level Exam