In previous years I've went overboard trying to make this "test" seem authentic, but this year I decided to just be honest and direct. "All of these problems were solved incorrectly. All of the answers are wrong," I told them. "These are the mistakes I've been seeing too many of you continue to make, and I don't want you to make them again on the test." If you've been reviewing something for what seems like forever, or you simplify have a stale routine, this is an easy way to shake things up.
In the example below (which my students worked on yesterday), you'll see the key mistakes circled along with the correct answer in red. The student version had no such marks (there was another side to this page as well that I chose not to include).
Share your versions of this kind of review assignment (along with any other creative ideas you have) in the comments.