Science

Can you please tell me the college, you wish to get in, so that I can guide you better, as every college has different syllabus criteria.

Educational Requirements for Astronomy:
Most astronomy positions require a Ph.D in the field of astronomy, which usually takes 5-7 years to complete. These programs are likely to contain courses in astrophysics, stellar and planetary physics, galaxies, cosmology, interstellar medium and optics. Mathe

There are over 18 M.Sc in Forensic Science colleges in India offering 20 Courses. Please refer to the link provided below for a detailed list of these colleges. You should be able to navigate to the best colleges on the list using the filters on the webpage.
Regards.
https://www.shiksha.com/science/

Can you please tell me the course name that you have completed from NISER, so that I can guide you better?

The faculty members of chemistry in PGP College of Arts and Science are good.

Yes, chemistry subject is there for SNUSAT exam. Please refer to the link below:
https://www.shiksha.com/university/shiv-nadar-university/exams/snusat/syllabus

You will have to fill the admission form to start with and then follow the admission procedure suggested by the college.