Sorry to say but you didn't scored enough to get seat in NIT as the cut offs for NITs for any branch is very high as compared to other colleges If we have a look on previous year cut off in general you need to score below 50k to get into NITs and below 20k to get into top NITs with you desired branch however with your obc rank you might be able to get a college but definately not any good NIT or IIIT but there are many colleges who have jee main reservations in them and some percent of seats are reserved for the students who're taking admission through mains so there's still some hope left for you. you can see what colleges you might get with this rank with the help of our jee main college predictor you just need to enter your rank your category,your home state and your desired branches and you're good to go and you can even have a look on previous year cut offs of NITs and other colleges. I am providing you the link for all. 

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

https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits

https://engineering.careers360.com/articles/jee-main-cutoff

Hi Mihir, if you got 45 marks in jee-main then check it out college predictor:
https://engineering.careers360.com/jee-main-college-predictor

good luck

hii

there is pretty low chnaces of getting NITs while its impossible i can say while check out the other colleges which acept the jee score in the given link below

https://engineering.careers360.com/articles/jee-main-cutoff

all the best