India

Hello,
Hope you are doing well. You can check the list of colleges including NIT and IIITs which you can get according to your marks and rank. Use Shiksha JEE College Predictor:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993

These NITs are not good in terms of placements. In my view, you son should get admission in a good deemed university.

1. Vivekananda Institute of Professional Studies - [VIPS]
2. NIMS University, Jaipur
3. Institute of Management Studies - [IMS], Noida
4. Dr. C. V. Raman University - [CVRU], Bilaspur
5. Noida International University - [NIU]
6. Mewar University - [MU],
7. Jagran Institute of Management and Mass Communication - [JIMMC]
8. Jaipur National University - [JNU]
9. Eastern Institute for Integrated Learning in Management - [EIILM University]
10. Loyola College.

If your category is general and OBC, don't waste time for IIT or NIT, if you want to drop a year, you can select a state level college.

According to your interest, you can choose best stream in B.Sc. But nowadays, B.Sc. Hons in physics is more demanding in India.