Hello Rahul,
UAS, Banglore is one of the best college for agricultural studies. In order to get admission the basic eligibility criteria is that you should have passed 10+2 with PCB as your subject combination. The admission process is totally merit based. To get into the admission process you need to download application form from the college website and then fill it and then submit it along with the required doccuments on the website.
However for agriculturalist category students  there are some reserved seats and they have to pass a practical examination which is of 200 marks. The students belonging to this category are given admission based on their marks in practical exam and their 10+2 exam as well. Their selection criteria is 50%practical exam and 50% 10+2 exam marks. So, in order to get admission you have to do the above mentioned  things.
To get more information about the college and the fees structure, placements you can visit this linkhttp://www.careers360.com/university/university-of-agricultural-sciences-bangalore
Hope this answers your queries.
You can ask your further queries related to this in the comments section.
Thank you