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. 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 has a collection of more than 10,000 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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