Congratulations to your son for achieving such a good score. Although NITs are a great choice for Barch but I will suggest you to consider SPAs ( School of Planning and Architecture) as your topmost priority. There are three SPAs in India : SPA Delhi, SPA Bhopal and SPA Vijayawada.  I will list down some top NITs as well.

1. NIT Trichy

2. NIT Calicut

3. NIT Jaipur

4. NIT Bhopal

Hope this helps :)