Dear Sir/Ma'm, you can always pursue Bachelor of Science in Physics in any college of your choice unless you fulfill it's given cut-off by securing the required marks in the 12th boards. In some colleges, however they take separate entrance examination of their own in which if you qualify then only they consider you for admission.

Hello Hridhya,

After doing 10+2 and securing good marks in the exam you can easily get admission in B.sc course in any University. There are many universities in India who provide b.sc course in their campus. 

Some universities conduct an entrance test for taking the admission. You will have to fill application form according to eligibility criteria and after that they will take a test. Your admission will be based on that entrance test result only.

Sime universities folloe the merit rule. You will have to apply in the University by registering yourself. According to the basis of merit and cut off you will be selected. If you would be having high % you will get admission easily.

Good luck.