Hello there!

There are two ways in which B.Sc admission in various Indian institutions/universities is done

1.Based on the merit they got

2.Based on the entrance exam the college conducts

Although Some of the B.Sc institutions offer admissions based on the score they secured in their 12th standard

where as some other institutions conduct their own entrance exams. In the entrance test-based admission process, the candidates have to appear in a counselling round or personal interview round and on the basis of the cumulative score, admissions are granted. Some of the institutions also offer B.Sc programmes in correspondence mode where a few of them conduct entrance tests for admission and some take into account the class XIIth scores

click on the link below to know more about the colleges

Link Click here

I hope this resolves your query

Good luck!