I want to do b.sc from science and my streme is PCB. Where can I get admission in india currently?

You can do BSc from any college India if you have the eligibility and marks required for that college to have a rank so that you get admitted.

You may go for Biology and its related field hons or general course. Also you can pursue Chemistry(hons/general) but not physics. In physics the colleges have eligibility of compulsory having Mathematics in 10+2.

So I will recommend you to search for colleges which will be convenient for you and you may get a chance according to your merit either by giving entrance exam or by your 10+2 marks.

I hope my answer helps you. All the very best for your future endeavors!