Hi,

With the marks of 273 in ICAR and belonging to the OBC category, the chances of getting a seat is quite low as your marks are quite low enough.  You have to score more than 50% approximately more than 360 marks to get a Good rank for a good university. However you may definitely try for Agriculture college seats which might be possible with your respective marks. Hoping for the best. For more information refer to

https://university.careers360.com/articles/icar-aieea