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Below are some YouTube Channels you can use to re-learn a lesson or receive additional practice. You're more than welcome to help update the list!
https://www.youtube.com/user/mathantics
https://www.youtube.com/user/patrickJMT
https://www.youtube.com/playlist?list=PLJ-ma5dJyAqq35Nj4mv1cFTJVD-DXehXE