Hey Saurabh,
You have not mentioned about the college in which you want to apply for admission in B.Sc. Zoology course, as it could make us easier to answer your query.
But you can apply in a college when the application forms of that university are released for admission to the course. Most of the universities release its forms upto this time, so you can easily apply in the college by registering or filling the application form of the university on the official website.
Still I am here mentioning some eligibility criterias for admission to this course (B.Sc. Zoology), these are :

• Candidate must have passed 12th examinations with Physics, Chemistry and Biology /Biotechnology as compulsory subjects.
• Candidate must have scored minimum 55% marks in aggregate in the qualifying examination.

Good Luck!