Khan Academy is an organisation on a mission. They’re a not-for-profit with the goal of changing education for the better by providing a free, world-class education for anyone, anywhere.
All of the site’s resources are available to anyone. It doesn’t matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get a leg up in earthly biology. Khan Academy’s materials and resources are available to you completely free of charge.
These fantastic courses are available in a multitude of areas, so no matter what interests you, you can always find something that suits. Subjects include maths, science and engineering, computing, arts and humanities, economics and finance and test preparation.