At 97.978 percentile your general air will be above 30k so on that basis you don't have any chance of getting cse in nit trichy on the basis of your obc rank you also don't have any chance but nothing can be said in this matter as obc ranks can fluctuate on the number of obc candidates getting more percentile than you so it is quite sure that even on obc rank basis you will not get cse but you can wait and watch but for your info this year obc cutoff for cse was about 1.8k rank so you can move forward accordingly also you can predict your college using this link

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