Science

Yes, you can do B.Sc. It depends in which area you want to pursue. Some University or colleges demand for Science background, some will give you chance to do B.Sc.

The basic eligibility criteria set for M.Sc Mathematics course is a Bachelor's degree in any discipline with mathematics, as the main subject, from any recognized university or board. So, if you had Mathematics as one of your main subject in graduation, then you can apply for the course.

Yes, you are eligible to apply for NEST on the basis of your Intermediate subjects.

BA in Astronomy is a popular course, or you can also pursue BA in Sanskrit, and then pursue MA in Astronomy. For college, I would suggest for a local one, as there are a few good colleges, but it is not worth to leave home to study in such colleges, as there are no placements and in the end only your degree will matter anyway.

B.Sc from BHU is really a good option, don't come in AKTU (if you will not get any good college). Try to get admission in IET Lucknow or KNIT Sultanpur. These colleges have good history of producing good engineers, BIET Jhansi will also be a good option if you got it.

Hi,
Eligibility Criteria for B.Tech biotechnology at IPU:
A Candidate Must have passed 10+2 pattern of CBSE or equivalent with a minimum aggregate of 55% marks in Physics, Chemistry and Mathematics provided the candidate has passed in each subject separately. Candidate must additionally have passed English as a subject of study (core/ elective/ functional) in the qualifying examination. Thanks.

Hi,
The basic eligibility for this course is pass in 10+2with subjects like mathematics, physics, chemistry, biology etc. Yes, Maths is compulsory for B.Tech biotechnology. Thanks.

Hi,
If you have completed this course, you can further pursue Masters of Engineering or Master of Technology by clearing GATE score for admission. Thanks.

Hi,
Some of the best B.Sc. Biotechnology colleges in Kolkata: St. Xavier's College, Kolkata
Park Street, Kolkata
Techno India University
Salt Lake City, Kolkata
MAKAUT - Maulana Abul Kalam Azad University of Technology
Salt Lake City, Kolkata
For more details information you can see below link
https://www.shiksha.com/science/colleges/biotechnology-colleges-Kolkata
Thanks.