Which field to opt for my post graduation: agriculture or biotechnology? Which exam do I need to appear in?

Hey Rajesh, It completely depends on your future plans that in which field you want to make your career. However a general suggestion would be to go with the biotechnology branch instead of agriculture. As your marks are already good, you may be eligible for good amount of scholarship. You can check

Obviously biotechnology should be your preference as it is your mother subject. U can pursue m.sc/mba in it. All the best.