Yes he is definitely eligible to choose Computer Science Engineering and he might get into some of the top notch engineering colleges in India to pursue his Banchelor's of technology in Computer Science Engineering.

For more details kindly visit the links shared below:

https://engineering.careers360.com/articles/jee-advanced-cutoff

https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iits

https://engineering.careers360.com/articles/jee-main-cutoff

hello

he will be eligible for computer science and engineering in nits but not in an IIT until he qualifies jee advanced. this is a good percentile and he can get cse in decent nits at this rank but he should aim higher and focus on advanced at present.