There is a review activity that I love, called Quiz-Quiz-Trade. It works like this: Every student gets an index card and writes one question on it to test their peers on their learning for the day/unit/etc. Then everyone gets up out of their seats and finds a partner. Partners quiz each other using their self-created questions (This is the Quiz-Quiz part). Then they trade cards and find a new partner to quiz using the previous partner's question (This is the Trade). Repeat.