Science

You are eligible for seeking admission in MBA, MCA, lateral admission in second year of B.Tech after B.Sc (Hons.) chemistry.

Both ISRO and DRDO very rarely advertise requirement of recruiting Scientific Officer with M.Sc maths as eligibility criteria. You may apply for Technical Assistant job when these are advertised. You may also evaluate doing M.Tech in computational science to become eligible for vacancies open for CSE graduates.

If you want to stick to your field, you can choose MBA (Systems). The difference would be the pay package after MBA.

After B.Sc nursing, you can go for higher education i.e., M.Sc (Nursing). There are numerous nursing institutes in India that offer students with an assortment of nursing courses like:
1. Educators.
2. General nursing and midwifery (GNM).
3. Hospital nursing.
4. Orthopedic nursing.
5. Psychiatric nursing.
Also, you can choose to go for other short term courses like M.Sc in biotechnology, M.Sc in neuroscience, M.Sc clinical research, M.Sc medical sociology, etc. or even opt for MBA in pharmaceutical management or hospital management.

Hello Sahil,
You should do M.Tech because you have done B.Tech, so M.Tech will be good for you, rather than BAMS.