Hello..Sam..

Well Congratulations for scoring such a good rank in cusat entrance examination. If you are a non keralite than their will be less chance for you to get admission in Computer science branch but you can ho for other branches where your chances are very high such as ECE,IT,ME these branch are very good and you have a great chance to get a seat in any of these branches. 

Hope you get that ..if uou have furthur queries regarding this then comment below..

Good luck...