Hey Haribabu,

You may get a good NIT with this much score in JEE Mains examination. You can get CSE at average NIT with this score through ST category. I will suggest you to use the college predictor by career 360 in the link below to know the possibilities of getting the college:

https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=2ahUKEwi13aiHgvzhAhXFqo8KHQQIC2cQFjABegQIARAB&url=https%3A%2F%2Fengineering.careers360.com%2Fjee-main-college-predictor&usg=AOvVaw1pTMu5LewXe0n3JPiA8V2U

good luck !