Hello Rameshyama, since the score is quite good so I'm pretty sure that he can get CSE in top NIT, you can use college predictor tool of career 360 and get your query solved but first you need to get rank for that also I'm giving the link below please have a look

Rank predictor

https://www.google.co.in/url?sa=i&source=undefined&cd=&ved=0ahUKEwjfv76du_DfAhWGNY8KHVQgCiIQzPwBCAM&url=https%3A%2F%2Fengineering.careers360.com%2Farticles%2Fjee-main-rank-predictor&psig=AOvVaw39icMdp95Tqk5hf2RQQus4&ust=1547664915744817

College predictor

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

Good luck!!

Hope it helps

Hello..

By getting 240 u can definitely get cse in your home state NIT. But due to varying cutoffs u may or may not get it in other nits.