Hey there,
Your son can get CSE at average nits like NIT JSR, IIIT Kalyani, IIIT Allahabad, NIT Agartala, Mizoram etc. I will suggest you to tell your son to join the NIT with this much score in jee mains. He can easily get the CSE branch at this much score.
I hope you have got the answer.
Good luck !
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