is bio compulsory to write in kcet engineering for pcmb student

Hello Aspirant!
No, the subject Biology is not compulsory in KCET for Engineering courses.
Only Physics, Chemistry and Mathematics are the mandatory subjects.
You can get the complete syllabus for KCET 2020 at : http://engineering.careers360.com/articles/kcet-syllabus

Hope this answer will help.

Hello student Kcet eligibility says - Candidates must passed or appearing class 12 with physics and mathematics as compulsory and any one of the following subjects - chemistry /Biotechnology /biology /electronics /computer with minimum 45 percent marks aggregate from a recognized board.
For more updates refer to the link mentioned below - https://www.google.com/amp/s/engineering.careers360.com/articles/kcet-eligibility-criteria
Feel free to comment if you have any doubt
Good luck