Hello Aspirant,
Yes of course, you are eligible for admission to NITs and IITs because you have cleared the qualifying percentage in 10+2. According to National Testing Agency (NTA) you should score minimum 75% marks in 10+2 to be eligible for JEE-Main.
Note that you must have to appear for JEE-Main in order to get NITs or IIITs and should qualify JEE-Advance also to get into IITs.
You can get more details about JEE-Main form the link given below :-
https://engineering.careers360.com/exams/jee-main?utm_source=google&utm_medium=kg
For more details about JEE-Advance you should refer to the link given below :-
https://engineering.careers360.com/exams/jee-advanced?utm_source=google&utm_medium=kg
I hope this information helps you.
Good Luck!!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile