NIT

https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6375912
Hi buddy,
You can use this link to find best college for yourself. Hope this will help.

You can have one of the NITs. Check your chances through Shiksha's College Predictor. Check it here:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6540165.

Your marks should be 250 to get into the topmost NITs.

If you want to get an NIT, then your marks should 250 above.

In these marks, your son can get new NIT in CSE or old NIT in a lower branch.

The admission mainly depends on JEE examination. To get into NITs, good score in JEE Mains is required. To get into IITs, good score in JEE Advanced is required.

No. The order goes like this:
IIT
IIIT
NIT
GFTIs
So, IIIT is better than NIT. But, I suggest you to not choose according to this because it may differ from few respects. So, choose when you are satisfied. Also, if you are getting NIT, then enroll for it whether it is very far away from your home or it is a new NIT.
Best of luck.

You might come across certain difficulties in dropping 2 years as with your age you won't be able to apply to some colleges. You should consider you age as a factor first and if you think you can do well by dropping twice you should go ahead with your plan.
good luck.

It will depend on Category. For General, there will be less marks for NIT.

You should use the Shiksha JEE Mains College Predictor. Link is below:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=6540165.