Dear aspirant,

Yes, the mop up round is depended on the availability of seat in the colleges. But on a general basis a mop up round is conducted due to the vacant seats in colleges because some of the colleges have vacancy in their different branches.

However various factors are considered while deciding the cut offs like number of candidates appearing in the examination, number of vacant seats in college, previous years cut offs and difficulty level of the paper.

For more information you can check out the link given below-

https://engineering.careers360.com/articles/kcet-cutoff