Hi Laxmi,

Congratulation for the result of your son. Since just mentioning south India can a little different opinion for different people, Here I am mentioning some of the top colleges that your son could get into in CS and remain as close to south as possible.

•  National Institute of Technology Goa
• National Institute of Technology Puducherry
• Indian Institute of Information Technology, Design & Manufacturing, Kancheepuram
• Indian Institute of Information Technology Srirangam, Tiruchirappalli

Hope it was useful to you.

Feel free to contact us for any queries.

All the best :)