If we have a look at the cut-offs for Indian Institute of Information Technology, Surat for 2021, then the ranks at which the branches close are as follows:

Computer Science and Engineering: 21,541
Electronics and Communication Engineering: 27,087

According to this it might be difficult for you to get admission in IIIT Surat, however you may get these in the Special or CSAB rounds.

You can also use our college predictor to see your chances in all the colleges:
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hope I have answered your question. All the best!