Hi,

The KCET exam is conducted by the Karnataka state. According to its eligibility criteria, candidates should have studied and passed either 1st and 2nd year Pre-University Examination or 11th and 12th standard examination within the State of Karnataka from an Educational Institution run or recognized by the State Government and that either of the parents should have studied in Karnataka for a minimum period of seven years. Also, Candidate should have studied in one or more Government or Government recognized educational institutions located in the State of Karnataka for a minimum period of seven academic years

With this eligibility, a student from outside the state is not eligible to apply for KCET exam.

Hope that helps.