Candidates who wish to appear for the KCET exam must ensure that they satisfy the KCET eligibility criteria. In order to appear for the KCET exam, candidates must have passed the class 12th examination/ 2nd PUC (Pre-Univeristy Course) or equivalent examination. It must be noted that the academic eligibility criteria for admission into various professional courses like engineering, pharmacy etc. will be different. 

As per the KCET age limit criteria, the candidate must have acquired the age of 17 years in order to appear for the exam. However, there is no upper age limit for appearing in the KCET entrance examination. Candidates are advised to carefully read the KCET eligibility criteria for the particular course they seek admission.