What are my chances of getting admission in ISI Kolkata in B.Stats if I dont have pretty good marks in 12th (mathematics) but I clear its entrance and subjective paper? Is there any chance?

ISI Kolkata is considered to be a good institute for B.Stats. It accepts admission purely on the basis of the entrance exam and the interview. The minimum eligibility criteria for the entrance is 70% in class 12th boards. 

The selection process will be finalized upon your performance in the entrance exam and the interview session. With this score, you will be able to pass through the cutoff but you must have an exemplary performance during the interview session.