Hi Komal,
Maths is a subject used in many jobs. You can definitely do a bachelors in Maths and then get into a career with pure mathematics, pure statistics, computer science, physical sciences, engineering or other related fields such as insurance, banking and accountancy. There are many specializations in mathematics too. Teaching at the undergraduate level after clearing the NET or SET is, of course, one option. Mathematical Research with institutes like Tata Institute of Fundamental Research, Institute of Mathematical Science is another option. Apart from teaching and research, you can apply your skills in Finance - Accounts & Equities, Operational Research & Quality Control, Bioinformatics and IT.
Higher study options after completing B.Sc in Mathematics:-
Master of Science in Financial Mathematics
Master of Science in Social Research Methods and Statistics
Master of Science in Mathematical Trading and Finance
Master of Science in Mathematics and Computing for Finance
Master of Science in Statistics with Applications in Medicine
Master of Science in Operational Research and Finance
Master of Science in Applied Mathematical Modelling and Scientific Computing
Master of Science in Pure Mathematics
Master of Science in Mathematical economics
Master of Science in Bio-statistics
Master of Science in Applied Mathematics
Master of Science in Agricultural Statistics
Master of Science in Mathematical Statistics
Master of Science in Statistics
Master of Science in Pure Mathematics
Master of Science in Computational Mathematics
Master of Arts in Mathematics
Master of Arts in Mathematical Statistics
Master of Philosophy in Applied Mathematics
Master of Philosophy in Mathematics
Master of Philosophy in Statistics
Master of Philosophy in Computing and Mathematical Sciences
Ph.D in Mathematics
Ph.D in Math Education
Refer to the below link to know about more institutes offering Master of Science (MSc) in Mathematics:
https://engineering.shiksha.com/msc-maths-in-india-categorypage-2-65-652-0-0-1-1-2-0-none-1-0#cateSearchBlockHope this information helps. Please feel free to revert. Click on the thumbs up or mark it as the best, if you found this useful.
Wish you luck!