I usually have a class of review before the midterm and final exams. I choose a couple of games that we can play. This week, I've been doing a Jeopardy kind of quiz show.
I make up categories from stuff that is on the test: "Vocab, grammar, movies, body" I think of questions that range from easy ($100) to difficult ($500). I put the students in groups of 3 or 4 and the they have to pick their category and question. They can pick whatever they want, but the key is that if they get it correct, they obviously get the points. If wrong, they get minus that number. I put in a few +/- 500/1000 to make it more interesting.