Hi

Yes, your class 12th marks are considered for KCET but only for checking whether you are eligible for KCET or not while the allotment of seat is completely on the basis of your rank in KCET examination.

For your reference,

KCET eligibility criteria is provided below for Btech:-

*candidate needs to be a citizen of India

*candidate need to pass  12th/2nd puc with at least 45 % or 40 % marks  in case of obc/sc/st in the aggregate of maths and physics as compulsory subjects  along with one of following as optional subject :-
-)Chemistry
-)Biotechnology
-) Biology
-)Electronics
-)Computer Science

Needs to have  English as well.

-) Those who are appearing for 12th exam are also eligible provided they must pass and get the certificate before admission process starts.

You can get the complete details regarding eligibility criteria at
https://engineering.careers360.com/articles/kcet-eligibility-criteria

Thankyou