If you don't belong to the category then naturally you don't have the category certificate. Now if you don't able to produce the category certificate and if your seat is a reserved seat then your admission may get cancelled and if you got a seat based on your common Rank or General Rank then you have nothing to worry about.

To know more about KCET visit the link below:

https://www.careers360.com/exams/kcet

I hope this answer helps. All the very best for your future endeavors!