Hi there.
Your brother have very good chances to get NIIT . Also he can get Cs in NIIT ,but not surely in the top Niits . Also you can suggest him to cgeck his college prediction by the given link below . But as i said , there are decent chances for him to get in NIIT . Also his state quota and other things will surely help . And CS is a bit difficult but ECE will be surely available. But that all depends upon the counseling.
http://www.medicine.careers360.com/neet-college-predictor

You can not get a CRL of 13k with 96.6 percentile, so please mention the correct information. However you can check out the cutoff for the different colleges here

https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches/amp&ved=2ahUKEwi1nMWxoO3iAhWZbysKHZKtBDEQFjACegQICRAB&usg=AOvVaw2OXl9cMS4B7GJ9DfTIJZCg&ampcf=1

Good luck!

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