What should I do after doing math honors from DU?

In general, a BSc (Hons) in Math is a good course that leads to a variety of career opportunities, including - 

1. Masters: After completing a BSc Hons in Mathematics, one can pursue a MSc in Mathematics, Statistics, Operational Research, Pure Mathematics, Applied Mathematics, Mathematics and Computing, or Mathematics and Computing. Some prestigious institutes that offer MSc in Mathematics include IITs, IISER, IISc Bangalore, Tata Institute of Fundamental Research, University of Hyderabad, and Chennai Mathematical Institute

2. MBA: Following a BSc Hons in Math, an MBA is a good option for starting your career.

3. Actuarial Science: If you want a job right after graduation, pursuing and passing at least three actuarial science exams will get you a good job.

4. MCA / CODING: The IT industry is one of the fastest growing in INDIA, with many job opportunities available after a BSc Hons in Math. You can pursue IT jobs if you know a little coding, or you can pursue MCA, for which you will have to give NIMCET exams.

5. Teaching: After completing your BSc Hons, you can pursue a career in education by taking the B.ED or, if you want to be a professor or lecturer, the JRF or NET exam.

There are various other scopes available for students. They can also pursue a career in Research, go for Government Jobs (SSC), DRDO, ISRO, and so on.