Learnerator is a cool tool for doing exam prep. They are currently focused on AP exams but seem to be expanding into SAT and ACT as well. What makes it useful is the amount of content they have that is in the style of the AP. There are 1,000+ AP European History questions and 600+ AP Chemistry questions written for the new AP Chemistry exam, for example. Most of the content is offered for free as well and there are some neat gamification features.
Learnerator is a cool tool for doing exam prep. They are currently focused on AP exams but seem to be expanding into SAT and ACT as well. What makes it useful is the amount of content they have that is in the style of the AP. There are 1,000+ AP European History questions and 600+ AP Chemistry questions written for the new AP Chemistry exam, for example. Most of the content is offered for free as well and there are some neat gamification features.