Hello dear,

Many major central universities are conducting common entrance test for their UG courses starting from this year, so in order to prepare for your BSc programme in physics I'll advice you to check the websites of the desired university and college in order to acquaint yourself with the question pattern and syllabus of their entrance test.

Many central Universities such as BHU have their previous year question paper available on their website, so you can easily download it from there.

Furthermore, have strong grip over you PCB/PCM syllabus of class 11th and 12th, go through the NCERT as all the entrance exams are somewhat based around your knowledge about your subject upto class 12.

All the best!!