Hello Mohan,
At this rank in JEE Advance, it is difficult to get CSE in OBC category. But don't worry you have the chance of getting other branches in IIT's. To predict your college follow the link below.
https://engineering.careers360.com/jee-advanced-college-predictor?icn=JEE_Advanced_clgpd&ici=JEE_Advanced_article_view_sticky
Best Wishes.
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