How come not every teacher gives a formal study guide?

For example, the English I test was about the things that we covered all year. Example of FORMAL REVIEW is "What is the climax of Romeo & Juliet?" If you study all the info that's given to you, you'll remember it, it will be rephrased on the test Example: "The climax of Romeo & Juliet is most likely" Answer right there. I don't see what's hard about doing that.