This year, there have been changes made to JEE Advanced eligibility criteria. The minimum aggregate criteria has been waived for IITs. To qualify for JEE Mains, there is no minimum aggregate criteria. But if you want to join NITs, IIITs or CFTIs  until now,  you should score a minimum aggregate of 75% only in your 12th. 11th marks aren't considered. And then to appear for JEE Advanced which is the gateway for admission to IITs,until now, you had to fulfill the 75% aggregate condition. Now it is 75% for General Category and 65% for Reserved Categories. So how much you score in 12th is what matters to secure your eligibility for NITs, IIITs, CFTIs and JEE Advanced. This was the norm until now. But due to Corona Pandemic, IITs have waived off the minimum eligibility criteria of 65%-75% in your 12th. So even if you have scored only 65% in your 12th, should you score the qualifying marks in JEE Mains, you will be eligible for JEE Advanced.