Some people love multiple-choice exams, and some people hate them. People who love them say that it’s nice to know that you have between a 20 and 25 percent chance of getting the right answer. People who hate them say that this type of test oversimplifies complex problems when many answers could be right. A good rule of thumb is to stop looking for which answers are possible, and look for the answer that’s best. Don’t be afraid to mark up the exam by crossing out every answer that’s definitely wrong. And if you’ve narrowed it down to two but aren’t sure, just pick one and move on to the next question.