To get admission in IIT-Kanpur in B.Tech in CS, you will have to clear Jee Advanced as IITs accept Jee Advanced rank to offer seats (but to be eligible for the same first you will have to clear Jee main) and once you get required rank then you will have to participate in JOSAA counseling. Also, this is one of the top IITs so its cut off goes little high like in previous year the closing rank for CS for general category was 206.

So I would suggest you to go through the below links to check the eligibility, complete seat allotment and Jee advanced counseling process in IITs and let me know if there is any doubt -

https://engineering.careers360.com/articles/jee-advanced-counselling-and-seat-allotment

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

Good Luck!!!