Yes he can join NIT but he has to start from first year itself. There is no way to begin directly from second year of B. Tech. No doubt his rank is a descent one and he can get chance in top NITs.

However you have a chance to get a list of prescribed colleges against his JEE Main rank. You just need to use JEE MAIN COLLEGE PREDICTOR. Click the link below, put necessary information and get result instantly.

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

All the best.