Websites
A bit of everything
Spark Notes provides you with key facts, explanations and analyses (and tests of your knowledge too) of both litterature, historical events and science topics. Their No Fear Shakespeare series is great if you need a little help with understanding and intepreting Shakespeares texts.
Khan Academy is a great resource for students. They make videos, texts and much more on a lot of subject including certain tests (e.g. SAT).
Also available as an app for your phone.
Learn languages
Duolingo
Duolingo is one of the best places online to learn languages.
You quickly gain a big vocabulary and you can set goals, track your progress and even add your fluency to your LinkedIn-profile.
Duolingo offers the following languages:
Spanish, French, German, Italian, Portugese, Dutch, Swedish, Russian, Irish, Turkish, Danish, Norwegian (Bokmål), Polish, Esperanto, Ukrainian, Welsh, Hebrew, Vietnamese, Hungarian, Greek, Romanian, Czech, Swahili, Hindi, Klingon, Indonesian and Korean
Memorization
Quizlet
Quizlet makes memorization that little bit easier.
You start by making a study set with a term and a corresponding definition. Quizlet then creates different ways to learn these terms:
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Flashcards – like your standard flashcards
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Learn – where you get the definition and then have to write the term.
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Speller – where you learn how to spell the term/definition
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Test – here you can test yourself
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Scatter – a game
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Gravity – likewise a game
Quizlet also has an app for your phone.