Hello Krishna.

See ur son has scored a good score in the JEE MAINS. With this score he will be eligible to get the best colleges of NITs for his higher studies. About the rank it will be below 20k and he will be getting most of the courses in best colleges for btech career. I m providing u a link for rank prediction for ur help.

https://engineering.careers360.com/jee-main-rank-predictor?utm_source=google-search&utm_medium=paid&utm_campaign=jeemain-rp

And for the colleges he will be getting use this link.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/jee-main-college-predictor&ved=2ahUKEwjZkMOY7s_hAhXm6XMBHbdcDiQQFjABegQIBRAB&usg=AOvVaw1pTMu5LewXe0n3JPiA8V2U

Ask if any query. Good luck