First of all, Congrats Ritesh for your 97.8 percentile.

97.8 percentile shall roughly correspond to 17,000 rank around in common merit list.

With this rank you can easily get seat in  Top NIT's .

But for CS, you have less chances.

To get in detail report and more details, please use our college predictor tool you can definitely get solution for your question

To know your admission chances in JOSSA & State counseling you can use JEE Main college Predictor tool from here :-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Thank you.