Teachers now have excellent free resources to help student’s master particular subjects when they want and at their own pace.

The Kahn Academy is using technology to transform instruction in the classroom, and provides a free library of over 2,400 videos covering everything from arithmetic to physics, finance, and history and 150 practice exercises. Introduction to programming and computer science has over 20 videos available.

Take a few minutes to listen to Salman Kahn speak to teachers on how they can help students through a “Knowledge Map” and improve the “student to valuable teacher time” ratio: Salman Khan Talk at TED