SAT does it teach how to take test or just test practice?

When you get a question wrong, it shows you which one is correct and why. There are also videos with examples

Expanding on what PaulO18 said earlier, Khan Academy provides a gamut of materials you can access including but is not limited to articles, videos and practice tests complete with videos and detailed answers. The articles not only introduce you to the new SAT but also provide tips about the test in general such as common test-taking strategies. The articles are meant to give you a (relatively) brief overview of the subject; the questions along with their respective videos give a more in-depth look at the test by showing the logic behind real SAT questions provided by College Board. To answer your question, Khan Academy not only teaches you how to take the test, it also provides you with real questions to practice and learn from. The detailed videos afterward provide a easy-to-comprehend explanation of the question and can be slowed down for easier learning.

Hope this helped!

Richard