Hi Bharath,

Don't worry at all if you are an Engineering seat aspirant then you are not expected to take Biology as a subject and you won't be asked to attempt Biology. The KCET might be handed over to NTA next year and what i know is you definitely won't be asked to take Biology compulsorily. There is actually no point of it for an Engineering aspirant.

Good Luck !!

Generally it is often required only the three subject but if you wish you can actually do the same by applying only four possible subject of your choice. It would be better if you provide specific three subjects choice only so that there is no possibility of faliure. Hope you understand and Good luck!