You should be aware that for BSc Physics, different universities or institutions have different entrance exam criteria. A lot of esteemed colleges like IITs and NITs have their own entrance examinations such as JEE Main and other university tests to screen applicants for the program. These tests are usually based on the 12th standards Physics and Mathematics and Chemistry papers.
However, many private universities and colleges offer admissions into BSc Physics programs right off the bat without entrance tests, provided that the applicant has done well in the Physics, Mathematics and Chemistry components of the 12th grade board exams. Other universities also tend to impose a cutoff mark for applicants. Remember to check what these institutions require as it can differ between them. It's good to be prepared for any entrance exams and to know what the requirements are as that will make applying easier.