School Yourself is an online learning site used to study math. On School Yourself, videos and the problem sets are weaved together. The creators of the site came to understand that, for each problem, there's a typical way many students might reach an incorrect answer. So, they incorporated that into their layout, so that if a student gets a problem wrong in the way others often do, there are instructions for that. Students who get a problem right won't see those sides steps meant for the students that didn't get the question correct right away. To learn more about, it see here.