Hey there!

Yes, you can get into NIT without getting good score in advanced. NITs take admission using your jee main ranking. You can apply through jossa counselling. You will have to fill out your choice of colleges and whatever is available at your rank would be provided to you. Choose the colleges according to your rank so that your chances are better. You can use careers360 jee main college predictor to get a prediction of colleges based on your ranking.

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer