Khan Academy/초중고 수학,물리,화학,생물,SAT

Khan Academy

Web Site

The Khan Academy is a not-for-profit organization with the mission of providing a high quality education to anyone, anywhere.
We have 1000+ videos on YouTube covering everything from basic arithmetic and algebra to differential equations, physics, chemistry, biology and finance which have been recorded by Salman Khan.
The Khan Academy and Salman Khan have received a 2009 Tech Award in Education. The Tech Awards is an international awards program that honors innovators from around the world who are applying technology to benefit humanity.
Sal has also developed a free, adaptive math program available here. ( Keep in mind that the web application is not fully supported and may not work properly with certain browser and/or network configurations)
To keep abreast of new videos as we add them, subscribe to the Khan Academy channel on YouTube.
The entire video library is shown below. Just click on a category or video title to start learning from the Khan Academy!

Calculus
Precalculus
Trigonometry
Algebra
Finance
Pre-algebra
Arithmetic
Geometry
Physics
SAT Preparation
Probability
Linear Algebra
Differential Equations
Credit Crisis
Banking and Money
Paulson Bailout
California Standards Test: Algebra II
California Standards Test: Algebra I
California Standards Test: Geometry
Venture Capital and Capital Markets
Statistics
Geithner Plan
Current Economics
Brain Teasers
Valuation and Investing
Chemistry
Biology