If you have gotten a rank of 31,862 in the Joint Entrance Examination Main, then the best National Institute of Technologies (NITs) and the best Indian Institutes of Information Technologies (IIITs) for you are as follows (for Computer Science and Engineering):

NIT Srinagar
NIT Mizoram
NIT Nagaland
NIT Meghalaya
NIT Arunachal Pradesh

IIIT Bhagalpur
IIIT Una
IIIT Sri City

Though the category you behold will play a decisive role in your admissions, but these are the general trends. You may also use our college predictor to see your chances:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope I have answered your question. All the best!