In order to be eligible for KCET you have to fulfill below eligibility criteria

• You must have studied and passed from a recognised institution situated in Karnataka. The academic study from a state institute should be for a minimum period of 7 years, starting from 1st standard to 2nd PUC/12th standard as on July 1 of the exam year.

• You should have appeared/passed either SSLC/10th standard or 2nd PUC/12th standard exam from Karnataka.

Do check out this link for KCET eligibility criteria

https://engineering.careers360.com/articles/kcet-eligibility-criteria