It is not the individual percentage of subjects which matters but the overall percentage of 12th . According to CBSE in order to get admission in IITs and NITs a candidate must have atleast 75%marks in 12th standard or he/she should be in top 20 percentile, this condition is also the eligibility criteria for JEE advanced. So your overall percentage should be 75 to be eligible for JEE advanced.

Good luck