How much percentage is required for iit in high school and intermideate?

There's no single percentage requirement for admission to IITs (Indian Institutes of Technology). Admission is based on performance in the JEE (Joint Entrance Examination), not on high school or intermediate (12th grade) percentages themselves. While a strong academic record in high school and intermediate is generally beneficial and might help in some scholarship applications, it doesn't directly determine eligibility for the JEE exam or admission to IITs. The JEE Advanced score is the primary determinant.