It focuses primarily on content for students in the US schools, but it's a reliable source for anyone with a hunger to learn. Khan Academy is worth using if you're on a budget and want to get a customized plan with practice exams and lessons to help you ace the test. You can use Khan Academy both online and offline - the app allows you to download your favorite content to your phone and browse it later even without an internet connection. Khan Academy has a collection of more than 5,500 videos and 100,000 practice problems covering K-12 math and select topics in science, history, business, art history and test preparation.
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