Hope you're doing good in this pandemic situation. Let me get straight to the point that yes you have close chances of getting a Bsc agriculture seat. You are right at the borderline.

Know details about Tamilnadu Agriculture University Coimbatore

https://www.careers360.com/university/tamil-nadu-agricultural-university-coimbatore

You have close chances of of getting the BSc agricultural seat.

You can also confirm that from the official website

https://tnau.ac.in/

I hope I helped,  if you have any more doubt you can ask them in the comments section.