My son has AIR 3027 in JEE Adv 2019 in general catagory. What choices he should fill & which iit ?

There are many choices available for 3k rank in Jee advanced. I'm listing some of them:
1.computer science and engineering : iit dhanbad
2. Textile engineering: iit delhi
3.engineering physics: iit delhi
4.mechanical engineering: iit bhu
5. Biotechnology : iit delhi
6.ocean engineering:iit kgp
7.Civil engineering:iit roorkee
8.engineering physics: iit roorkee
9.material science:iit kanpur
10.Chemical engineering:iit roorkee, iit guwahati
May be I have missed a quite few of them. You can check them out here in the following link. https://engineering-careers360-com.cdn.ampproject.org/v/s/engineering.careers360.com/articles/jee-advanced-college-predictor/amp?amp_js_v=a2&amp_gsa=1&usqp=mq331AQDoAEB#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fengineering.careers360.com%2Farticles%2Fjee-advanced-college-predictor