I would advise you to first pursue B.Sc. Mathematics in your Bachelors Degree, followed by Masters or if you wish Integrated Masters (BSc+MSc), then PhD from some of the Reputed Higher Technical Institutions abroad or in India like Top IITs, IISERs, IISc Bangalore, Indian Statistical Institute, CMI and many others in field of Mathematics, Computational Studies, Statistics, Quantitative Economics, Quantum Computing, Number Theory, Operational Research or other relevant Mathematics Research Fields. Once you complete your PhD, after a short research experience you may easily secure place with some of the good public or private universities as a Lecturer.

For more information about Career Options after BSc. In Mathematics do follow the link below

https://www.careers360.com/articles/10-online-career-options-after-bsc-maths

For more information about Mathematics Courses and Higher Studies do follow the link below

https://www.careers360.com/courses/mathematics-course