Students make a foldable book about the body systems. Do you not have much time to cover all the systems in depth? This activity is student centered and covers the major aspects for the exam in a fun an quick way. Also, see my body systems PP, Graphic Organizer and Exam for a complete teaching unit.
I have used this activity for many years. It is great for classroom management and can be a study guide for the test. It goes along with my teaching philosophy: Make the students work hard and not us!