Science

Please refer to this link:
https://www.shiksha.com/science/colleges/b-sc-colleges-patna

No, it's not possible because you chose physics. You can only do M.Sc in the subject which you opted for in B.Tech.

Hello,
There are many career options that you can opt for after completing your class 12th with PCM. If you have an interest in engineering then you can go with JEE Mains and Advanced exam and you can also do B.Sc, BBA, B.Arch, NDA, etc. It's all up to you that what are your future goals are and in

Yes, many colleges provide forensic science course and best option is Amity University, Jaipur.

Yes, if you think that you have a lot of faith and belief in yourself then you should take admission in the Drama School and work hard.

Both are good. It depends upon your area of interest. Whether you want to study arts or science. Think before choosing it as it is a life turning situation for a student after class 12. Follow your passion.
All the best.

Seats are available but your percentage does not meet the desired cut-off (sixth list) which is 82% for OBC. Try in other colleges. If vacant seats are available and the cut-off goes down then you may check again.