Khan Academy
has videos for math from 1st grade through 2nd year college, biology, chemistry, economics, finance, etc
so much stuff and its all free and all amazingly made!
About to watch a few hours of the differential equations videos
has videos for math from 1st grade through 2nd year college, biology, chemistry, economics, finance, etc
so much stuff and its all free and all amazingly made!
About to watch a few hours of the differential equations videos