Hey Abhishek

You need to have a minimum of 85 % in your 12th boards to get a seat in veterinary or agriculture colleges via kcet. More than this you need to get over 140 in kcet to be sure to get a seat. MArks may vary from year to year hence rank is a more sure way to get the seat (rank wise cutoff). Scoring a rank under 1800 will surely get you a seat in any veterinary or agriculture college via kcet. All the best.