Do you have several different topics that you’ll be testing? For example, you might have covered several different historical periods, several different biological processes, or several different pieces of literature. If so, create a wheel of topics by using a large piece of posterboard, a paper fastener, and a paper arrow. Attach the arrow to the posterboard so that your students can spin it around, and create several different categories that the arrow might land on. Divide your class into teams, and have one team spin the wheel. You can then ask the student a question from that topic.
Note: Even if you don’t think that you’ve taught several different topics, you can usually find some way to divide up your questions. For example, in a history class, you might divide it into “Important People,” “Important Events,” “Causes and Effects,” and “Which Came First?”