Dear student, as far as board percentage is concerned, the mininmum eligibility criteria has been waived for this year, so that won't be an issue.

However at 79 percentile in JEE Mains, you CRL rank comes around 214830 - 241500 , which makes it very tough to secure a core branch at a NIT. Use the rank predictor tool:

https://engineering.careers360.com/jee-main-rank-predictor

However you may try applying for the CSAB counselling in your home state quota for the left out seats, that again comes with a risk as there is no guarantee of a seat at your rank. Also you haven't specified your category and home state, with which I would have been able to provide more specified detail for your question. You may try using the college predictor to find out the best colleges at your rank:

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Hope it helps you, feel free to ask any query, thanks!