Hello

You son have secured very good marks in JEE Mains. you rank would be approximately in between 8000 to 9000.  Also, Above is the range of your possible rank. The predicted rank may vary due to JEE Main tie breaker rules for the same score.

If he have secured this rank you have a chance to get theses colleges:

NIT Andra Pradesh

IIIT Sri city

NIT Surakthal

NIT Hamirpur

NIT Rourkela

NIT Warangal

MNIT Jaipur

NIT Patna

NIT Trichy

NIT Calicut

NIT Rourkela

VNIT Nagpur

These are the college he will get if you have scored these marks. Also, if he have secured good marks in JEE Advanced, he will surely get an IIT.