dear Rishil Alkesh,

Definitely yes , A kerala citizen can apply for KCET 2020.Because the eligibility criteria of KCET is -

B.Tech courses is given below:

• Candidates must be a citizen of India
• Candidates must have passed 2nd PUC/Class 12/equivalent examination with Physics and Mathematics as mandatory subjects
• Along with the compulsory subjects, candidates must have anyone optional subjects - Biology/Chemistry/Bio-Technology/ Electronics/Computer Science with a language subject English
• General candidates must obtain a minimum of 45% and reserved candidates must have secured 40% in the case of Category-1 and OBC (2A, 2B, 3A and 3B) SC, ST

So the first eligibility criteria clearly indicates that you can apply for KCET for addmission in any course.

if you want to know more information about the KCET then you can go through the below link

https://www.careers360.com/exams/kcet