Gojimo. Gojimo was initially developed by a student for students. Gojimo offers thousands of free practice tests for students of high school age. Students can find practice tests for topics in science, math, history, geography, economics, and language arts. The app was originally designed for students in the UK, but it has expanded to offer SAT, ACT, and AP exam prep.
Gojimo is available as a free iPad app, as a free Android app, and as a free web app. Whichever app students choose to use, they will have access to all review content.
Applications for Education
One of the nice things about Gojimo is that after every question students can see an explanation of the correct answer. Students can choose to review a specific set of questions or they can review a set of questions randomly selected from a topic of their choosing.