Khan Academy is an organization on a mission. We'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 practice tests, tutorials, and eBooks will help high school students learn and review important math skills, and prepare for admissions exams and more advanced math subjects.
High schoolers can use the resources below to practice and review their science skills.
High schoolers can use the resources below to practice and review their social studies skills.