Academic​

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Khan Academy: Get help using Khan Academy for math, science and more.

https://www.khanacademy.org/

Quizlet: Study tools for almost anything.

http://quizlet.com/

Study Stack: Not just for math...free flashcards for serious fun studying.

http://www.studystack.com/

Varsity Tutoring: Test your knowledge, improve your scores and leverage on the free testing system.

http://www.varsitytutors.com/practice-tests

Power My learning: Free games, videos, and interactives.

http://powermylearning.org/