Hello Dear,

It is difficult to predict the exact KCET rank because it depends upon too many factors. According to you, you scored 81 marks in KCET 2021 then your rank would be under  4501 - 5000 . And you do not mention your category. So I am assuming that you belong to the general category. There is chance to get admission in some colleges for agriculture course that are accepting KCET scores such as

College Of Agriculture, Bangalore

College  Of Agriculture Engineering, Raichur

You can predict your rank from the link given below :-

KCET Marks vs Rank 2021 - Check Qualifying Marks (careers360.com)

You can also predict colleges from the link given below :-

To more information about KCET 2021:-

KCET 2021 - Result (Soon), Answer Key (Unofficial Out), Dates (Revised), Cut off, Counselling (careers360.com)

Hope this information helps you...

Best of luck :)