Hello paidikala . It is difficult to make you know that with this score in jee mains its impossible for you to get admission into any prestigious organization of engineering like nits or iits with cse and even your choice is computer science with top nits and iits as they need high score to get admission so even with your obc quota you cannot get cse branch . But you can get other branch in them so get admitted and try to change your branch in first year.