You have to search a rank under 1000 in JEE advanced to get CSE at IIT Roorkee, so far this you have to score above 50% marks in JEE advanced.
Hope it helps.
You should score a rank under 350 -400 in general category through JEE advanced to get this branch at IIT roorkee. I will tell you that marks varies each and every year, so I cannot tell you about the exact marks this year. If you score around 85-90 percentile in JEE advanced examination then you can easily get this branch.
Good luck !
IIT/JEE 2020 Online Preparation
Crack JEE 2020 with JEE Knockout Program, If you Do Not Quality- Get 100% MONEY BACK