Hello,
To get admission in NIT or IIT, you need to complete your class 12 with minimum 75% if you belong to General, OBC or EWS category. Or minimum 65% in class 12 if you belong to SC/ST category.
So first complete your 12th grade and then you must appear for JEE Mains and JEE Advanced exam to get an admission in NIT or IIT.
And you must also be among top 20 percentile of successful candidates of 12th grade exam.
By the above said criterion, you can obtain admission in NIT, IIT.
You can visit the below website to know more about it.
https://engineering.careers360.com/articles/how-get-admission-in-iits-after-diploma
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