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Generally the eligibility criteria for BSc Physics is  passed 10+2 from a recognized board with physics, chemistry, mathematics or biology securing above 50% aggregate(this may vary depending upon the norms of the college), admission can be done through entrance test or it can be based on the merit of the qualifying examination, some of the top colleges are Jadavpur University, St Xavier's College, Fegusson College etc, you can check out the entire list at https://university.careers360.com/colleges/list-of-bsc-in-physics-universities-in-india ,the date of release of application form isn't same for all colleges, so in order to provide you exact details you need to mention the name in the comment box, or you can visit the official website to know more details regarding this or you may also search our site for any relevant information.