CBSE

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It's 60% marks in PCB and separately 60% in honors subject. Like for chemistry honors must have 60% in chemistry and aggregate 60% in PCB. For B.sc maths as a subject in 10+2 level is mandatory.

Please click on the link to get a list of good B.Sc with physics Honors colleges in India.
https://www.shiksha.com/science/colleges/b-sc-colleges-india?uaf[]=sub_spec&ts=8037856&rf=filters&bc[]=26&ss[]=sp_405&ed[]=et_20

Hi,
Here is a list of the best colleges for the same:
https://www.shiksha.com/mass-communication-media/journalism/colleges/colleges-india
Their eligibility criteria may vary which you can check by clicking on the link of various institutes provided in the link mentioned above.

There is no competitive exam and the admission is based on merit of 12th.