You have scored an average rank in jee main but i think you'll be able to get admission very easily as 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 but you might have to compromise with teh choice of your branch as you might not be able to get the core branches in top NITs but you'll get them in the nits of slightly low ranking hoever there are many private and other government colleges that are linked with jee main you can easily get admission into them. 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