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Mathematics
OpenStudy (anonymous):

Any good precalculus resources out there? Hi, I have a pre-calculus exam coming up this Monday and I am almost done going over assignment questions, notes and examples. Do you have any links to practice questions, or on-line textbooks that can give me more problems to do? Google is an obvious way to go for searching these, but I would like your input.

OpenStudy (anonymous):

paul's notes http://tutorial.math.lamar.edu/

OpenStudy (anonymous):

You can try working through some problems out at khanacademy.org. Need a google or facebook account to track your progress in the problems though.

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