Hii varsha!

Hope you are doing well, the cutoff for class 11 science admission is not same across every school- it varies from school to school, city to city and even from state to state. Last year some of the topmost reputed schools has science cutoff going above 90%.

While in the private schools and Government schools may have slightly lower cutoffs. Basically, the higher demand for a school intends high cutoff for it.

As you have not mentioned the specific school you are talking about it's not possible for me to give you exact cutoff for previous year 11th science. But I will recommend you to work hard and score above 90% to be in a safer zone.

Secondly for checking exact cutoff for a school you can visit its official site or may contact school directly for previous years cutoff. A more informal way to check this would be asking students of that particular school regarding cutoff ( if any in contact with you).

All the best!