Algebra: https://www.youtube.com/playlist?list=PLGbL7EvScmU7ZqJW4HumYdDYv12Wt3yOk
Calculus: https://www.youtube.com/playlist?list=PL67C119EDA6BDE946
Geometry: https://www.youtube.com/playlist?list=PL668AB35C6885A036
Trigonometry: https://www.youtube.com/playlist?list=PL085526F86A268B57
Professor Dave Explains