To help students with their revision, this is a quick summary of resources for some of the main topic areas that I cover at IB History Level at ActiveHistory.
During revision time I tend to start each lesson by introducing the main task, then directing students to a 'Fling the Teacher' quiz. Students have 10 minutes to complete the quiz. Any student finishing within that time gets points into their 'leaderboard' (which builds up throughout the revision period) based on the amount of time left on the clock. They can then proceed to the main task.
It's a work in progress so there are still a few gaps here, but it should still prove useful - here's a video of some of my students doing the 'Fling the Teacher Leaderboard Challenge' in Summer 2013 (Georgia, in the hotseat, was the overall winner at the end of the competition!):