hii ,

the seat you get in kcet mock will be the most probable seat you will get , but its not like you will get those colleges in first round only and also you can also get better colleges than the one alloted to you in mock list so its better to attend counselling till end unless you get the college you wanted .

to better predict colleges through kcet rank and the branch you want you can use the free kcet college predictor - https://www.careers360.com/kcet-college-predictor?ici=cp-listing_root&icn=KCET-College-Predictor