Yes, you can get admission in NITs as this year the 75% marks criteria or being in top 20 percentile if respective boards have been withdrawn.

This year it's a bit different. As all the subjects of class 12 of several boards have not conducted and marks have been provided on the basis of internal assessment and previous exam marks, many students have affected by these. So this year, the criteria of at least 75% or being in top 20 percentile has been withdrawn and all the candidates who have passed 12th examination and meet the Jee Main Qualifying cutoffs will be eligible to sit for Jee Advanced 2020. And You can get admission to NITs. You will have to only produce the passing certificate of class 12.
You can check the cutoffs of NITs here
http://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

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