As you want to get the details of career after B.Sc (Maths) Hons except in the field of teaching so here is the information of the same for you:

Pure mathematics offer opportunities in

Software
Insurance
Market research
Securities
Banking sector etc.

Applied mathematics provide career opportunities as

Economists
Engineers
Computer Scientists
Physicists
Technicians

Government Career after B.Sc Mathematics:
The exams conducted in the public sector include which give importance to mathematics are

Tax Assistant exam
Statistical Investigator exam
Grade III & Compiler Exam
Combined Higher Secondary exam
Combined Graduate Level Exam etc.