• Schoolhouse.world is offering free virtual tutoring in math and SAT prep to secondary students. The nonprofit company was started by the founder of "Khan Academy" online and has partnered with Colorado Education Initiative to provide free tutoring in the state. The platform currently offers small group lessons for middle and high school math classes, such as pre-algebra, algebra, geometry and statistics, as well as SAT preparation. Tutoring is limited to ages 13 and up at this time.