Hello Akhil,
Congrats on qualifying mains.
Firstly it's quite not possible to get into NITs or IIITs with that rank of yours. Even after your reservation being applied for GEN-EWS category this year it's not possible getting into NIT or IIIT. Although it also does depend on the no of applications and seats available, but still you might hardly get mechanical or civil some courses like that in average NITs. Don't loose hope here. There's so much more opportunitites right in front of you. Keep trying for private institutes too. There are so many such institutes which provide their own exams and since you already wrote your mains it'll be easy for you to learn more topics and practise and solve more new questions. You might get in some decent colleges for sure but for NITs and IIITs, you need to work harder and secure a better rank. You can check out some other private institutes in the links below and try for those too. Even if you get in some decent college through your mains, try giving entrances for these colleges too if you'd like.
https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India?page=1
https://www.outlookindia.com/magazine/story/indias-best-private-universities-2018/300338
https://www.4icu.org/in/private/
BEST OF LUCK!
Thank You.
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