Chemistry

Don't worry, you have sufficient rank to get seat.

Previous year's cutoff was 60%.

Not a big problem, learn Chemistry step wise, just strenghthen your basics. Physical Chemistry is gonna be quite difficult for you to learn, just take your time and ensure that you understand. If you understand the concepts it would be more than enough for you to gain knowledge. There are many online courses available which will help you increase your Chemistry knowledge.

Hi Narendra,
Yes, you will get a seat in Andhra University for sure with 263 rank in entrance. Your rank is sufficient enough to get you a seat in this college. You should apply for this college. Best of luck.

Yes, you have good rank. You can get admission here. Good luck.

Yes, they give merit as well as entrance based admission.
Good luck.

If you are doing any job and also wants to do complete your education, then I would suggest you to go for distance education you can do distance M.Sc in that you don't need to attained classes you only need to go for exams.

Since you have already done B.Sc Chemistry, so now you can't go for physics graduation. You can do some other diploma course related to physics.

Yes, you can get admission.

For B.Sc in chemistry, maths is not a necessary requirement. You can apply via PCB background as well.