Imagine you’re a student preparing for an exam. You have three choices about how you can allocate your limited studying time. First, you can review the material. You can look over your notes and book and study everything until you’re sure you’ll remember it. Second, you can test yourself. You can keep the book shut and try to remember what was in it. Finally, you can create a concept map. You can write out the main concepts in a diagram, showing how they’re organized and related to other items you need to study. If you can pick only one, which one should you choose to do best on the final exam?