Hello ,

Aspirant as your query is that you want to take admission in BSc Honours Physics. Don't worry the procedure is really simple, all you have to do is after completing your 12th with physics as a subject : whether you are a Maths student or a Biology student that doesn't matter. Go for your state universities where BSc Hons Physics is in their course and based on their cut off you can apply in the college of your interest and at your cut off based after that you will definitely get a seat allotted to you in college. 

I hope your query is solved.

Thank you.