Science

Yes, you can do that. Every institute have different eligibility criteria to apply for M.Sc mathematics and you will have to appear for the entrance examination after fulfilling the application eligibility criteria.

B.Sc biotech has excellent opportunities as this is an emerging field.

Dear,
You can't go with BCA without Mathematics. Instead doing BBA followed by MBA may be suitable for you. It has job prospect too.

Dear,
As per your query and interest, I would recommend you need to check these fields and choose accordingly:
Physics Hons
Life Science
Zoology Hons
Biotechnology
Nanotechnology
Food technology
Microbiology
Wildlife Science
Environment Science
B pharma
Genetic
Neuroscience
Psychology
All the best.

All these streams are good and it depends upon your interest and inclination that streams suits you most. You must choose the stream as per your interest so that you may rise high in your field of interest. There is high demand for almost all these streams in corporate sector and in govt organisations. So do not worry about the trend, just follow your on inclination and liking for a particular stream.
All the best.

Hello Megan,
After cracking CET, you can get admission in colleges in Maharashtra and after clearing JEE Mains you can get admission in NIT, IIT CGF institutes etc. I would suggest you , take both the exam.