Dear Aspirant, congratulations on securing such a good rank. According to previous years' cutoffs, it is not possible to get NIT Warangal CSE branch as cutoffs have been too high. For details, you can check here:- https://engineering.careers360.com/articles/jee-main-cutoff-for-nit-warangal . Your son can get other NITS like:-

1.NIT Surat

2.NIT Delhi

3.NIT Kurukshetra

4.NIT Bhopal

5.NIT Durgapur

6.NIT Jamshedpur

7.NIT Goa

8.NIT Bhopal

9.NIT Raipur

10.NIT Silchar

11.NIT Puducherry

12.NIT Hazratbal

13.NIT Nagaland, Meghalaya, Sikkim, Agartala, Mizoram, Arunachal Pradesh

Nevertheless please wait for cutoffs to be out. Hope it helps!!