<p>@ OP: Going to his office hours can help. You might be able to go over the test with him and see what you did wrong. He can help clarify things for you. Also, it shows that you care about your grade. And when teachers see this, sometimes they are willing to cooperate more if they see that you are trying and are concerned about doing well in their class.</p>
<p>And if worse comes to worst, withdraw from the class – unless it pertains to your major.</p>