If a get sc category rank under 200 can i get cs in iit kanpur
Agar luck Accha ho toh, you can get it also!
It's quite difficult to get CSE with that much rank in IIT Kanpur as it is one of the top IITs in India for btech.You should try to secure at least under 100 rank in sc category to get admission there.
I suggest you to focus only on your study from now and prepare very well for jee.
Good luck.