Hope you are doing good in this pandemic situation. let me get straight to the point that cutoff for Bsc agriculture remains high in Kerala.

A general category student needs to score more than 400 marks and above. For a OBC category student enough to score more than 380. As you are scored 270 you have extremely low chances of getting a Bsc agriculture seat in in Kerala through ICAR.

You can check out the cut off here

Cutoff - http://icarcolleges.in/newsite/bsc-agriculture-cutoff-ranks-in-icars-aieea-ug-entrance-exam-2016/