My Social Studies students love to play Quiz Quiz Trade. This version is a "Who" version with important explorers in our Social Studies Curriculum. The cards fold in half so the answer is on the back if students need it. I have my students play this game for a few minutes each day while we're studying the explorers. Then, by the time they need to take the test, they are very ready. I also give my students their own copy of the cards so they can practice at home. They love this game!
I've also included the test that I use to assess knowledge about Explorers. It correlates directly with the Quiz Quiz Trade game.