Hardware & Networking

Better do some courses with Dell HP and IBM for a good professional career. You may get an internship as well.

If you know Programming skills than okay otherwise join any course with Basic for Ethical Hacking. A Hacker must be a computer systems expert and needs to have very strong programming and computer networking skills in the long term but you can start practising with simple tricks.

I cannot say about the ranks because no data is available. However, if your son is scoring above 90/120 in HITSEE, then he can get B.Tech CSE in Cyber Security.

Yes, you can study M.Tech CSE Cyber Security after B.Tech IT. The eligibility criteria of M.Tech CSE Cyber Security is B.E/ B.Tech Degree in CSE / ECE / EEE / EIE/IT, MCA M.Sc. In IT/CS, AMIE or other equivalent degree.