NIT

You can explore about-

• National Institute of Technology Tiruchirappalli
• National Institute of Technology Karnataka, Surathkal
• National Institute of Technology Rourkela 

These are top 3 NIT in every prospect be it placement, teaching quality, or brand value.

You can use  Shiksha college predictor-

https://www.shiksha.com/college-predictor

With this percentile it would be diificult for you to get into NITs. Rank will be alloted as per the number of students and category of the students for shortlisting the candidates. You should wait for the official announcement . Hope this helps.

Yes, it is nice but you can’t get any NITs because now a days, competition is very high. 
Everyone is trying to get into NITs and IIITs, although there is a chance to get in GFFTIs and IIITs.

Hello Diya, almost every student gave this branch as the first choice. Closing ranks are very high respective of the category in which the student belongs to. Shiksha has compiled a database of closing ranks across different rounds of admissions for this branch across all the NITs and has them compiled in a PDF file that you can download and read comfortably later on. To help you I am attaching that link below. I am sure after going through this all your doubts will be answered.

https://www.shiksha.com/engineering/articles/nit-cse-cutoff-2021-josaa-blogId-71951

Don't do that, if you repeat class 12, this will led to turn down the whole year . You can get admission in B.Tech.

You are eligible for IIT, just work hard in JEE Main to qualify Cut Off and in Advance to get IIT and NIT.