Khan Academy has AWESOME videos and practice problems for SAT, GMAT, and other test preparation. Adults who are struggling to improve their English reading and writing skills, or master the 5 subjects to pass the GED test, are at the bottom of our economic ladder. Educating low literate adults brings children out of poverty while reducing crime and government spending. Eager adult learners should be the first priority and target audience for a "free world class education [for] anyone anywhere."