​If there is some material you didn't understand in class, the best online resource i that I've come across is ​

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​http://www.khanacademy.org/. ​

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Go to the site and search whatever we're learning at that point - use the section title in your book. For instance, if you're having trouble with factoring, go to the site, enter "factoring" in the search bar, and see if any of the videos are helpful!​