Myabe you could ask around and see if a lot of people prefer a certain professor. Then take a class with that professor. Sometimes if the professor is incredibly dull, you will have a hard time in the class. If you have a good professor who is interesting and fun, the class will be more enjoyable and you will do better in it.
I had to take political science in college and thought it would be horrible, since I didn't think I'd be interested at all. But my professor was great and I ended up getting an A.
