NT stands for Nomadic Tribe. So NT1, NT2 and NT3 are Categories of Nomadic tribes listed in Maharashtra Caste  list. Maharashtra B.V.Sc seats are filled through 15% All India Counselling and 85% State Counselling. The State Quota seats are filled divided into 70% Regional quota and 30% State Quota. The 70% Regional quota seats are reserved for Candidates belonging to Vidarbha, Marathwada and Rest of Maharashtra. And the Constitutional quota of Maharashtra is for Candidates belonging to SC, ST, Vimukta Jati/Denotified Tribes, NT-A,B,C,D and OBC. NT-B falls under OBC Category.  So for a seat under NT B Category in a Government Veterinary College, 350 might be a tad less. We do not have previous years data but cut offs do change every year. Cut offs change every year depending on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. So you will need to score atleast 450 and above for a seat in a Government College.