Hello, 

As per your requirement, i would say that as you have got 431 marks in obc category,  so it would be quite possible for you to get a government seat in your state  but you may get it even as you have obc caste reservation for you to avail but generally its safe to score above 400 marks because any state basically has a high cut off as lot of students belong from many state.

For vetenary you can get a government college- seat whose counseling will be done through the vci through neet exam. Participate in the vci counseling then chevk the merit list.

Getting a seat in government medical college is depending on many factors like studenrs to seat ratio, cut off, reservation etc. 

The cut off as per your caste would also depend on which state domicile you have as few states havr higher cut off .So it varies from state to state.

Good luck