And, if you choose to create a free account, your learning syncs with, so your progress is always up-to-date across all your devices.

Pick up where you left off: Tailored to your current learning level, our mastery system gives instant feedback and recommendations on exactly which skills and videos to try next.

Keep learning when you're offline: Bookmark and download your favorite content to watch videos without an internet connection. Follow along with what you're learning in school, or practice at your own pace. Sharpen your skills: Practice exercises, quizzes, and tests with instant feedback and step-by-step hints. Study math, science, economics, finance, grammar, history, government, politics, and much, much more. Learn anything, for free: Thousands of interactive exercises, videos, and articles at your fingertips. Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology â Khan Academy's personalized learning library is available to you, for free. Or, if you're feeling particularly adventurous, learn how fire-stick farming changes the landscape of Australia. Get a head start on next semester's geometry. You can download lessons using BitTorrent App as well.Spend an afternoon brushing up on statistics. All the lecture videos are available both on his website and YouTube. Salman Khan, the man behind Khan Academy is admired by the entire world for his determination and efforts to create so many videos and posting them online for free. Khan Academy is one of the most famous destination for online courses of late.

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