Dear Aspirant 

First of all Congratulating you on your nice performance and I would like to tell you that based on your rank in ST category I feel sorry to inform you that it is very difficult for you to get a seat in government college like IIIT, NIT. However I would suggest you to wait for final round and if you could not get then you should register for spot round counselling conducted by JoSAA at the end of the rounds counselling. 

Good luck for your future :) 

Feel free to ask if you have any further queries.