Set up a Jeopardy board on the blackboard and cover up the answers with pieces of paper. Make the categories related to the theme of the exam. For example, you could use cells, tissues, organs, systems and organisms as the topics. Divide the class up into teams and require them to answer in Jeopardy style. They should take turns selecting questions for certain point values, and must answer with a question: for instance, "What is the digestive system"? Correct answers win the allotted point value, while incorrect answers lose it.
For the first round of this game, think of a concept or word related to the topic of study, such as the respiratory system or single celled organisms. Tell students that they must guess what you are thinking of by asking 20 questions that can be answered with a yes or no. Once the first round is over, have students take turns choosing words or topics and facilitating answering questions.
Distribute bingo cards with words related to the test material on them in place of numbers. For example, you might have "carnivores," "herbivores" and "omnivores" on the cards. You could play by simply calling out the words and having students use a marker on the ones that they have. However, you could also give clues. You could say "This word is used to describe animals that eat only plants." Students who have "herbivores" on their cards would mark it down.
Write different scientific terms on cards, and invite a student up to the board to act as the drawer. The student will pick one of the cards, and then draw the image associated with that word as best as possible on the board. The rest of the class must guess what is being drawn. Students can play this game independently or on teams.