KHAN ACADEMY contains over 3000 free videos and interactives on subjects including math, science, economics, arts, humanities, computing, test prep, and other topics. These short, self-instructional videos and interactive lessons help children and young adults with specific, foundational skills. The test prep section is particularly helpful for teens seeking assistance in preparing for the SAT.
This not-for-profit website is an excellent way to help K-12 youth succeed. Students can work at their own pace. There’s even a way for teachers to track student progress.
To learn more, go to KHANACADEMY at https://www.khanacademy.org/.