Here are some excellent YouTube playlists for the subjects you mentioned. I have used and can vouch for the high quality of all of them: Linear Algebra: https:

Here are some excellent YouTube playlists for the subjects you mentioned. I have used and can vouch for the high quality of all of them: Linear Algebra: https://www.youtube.com/playlist?list=PLlXfTHzgMRUKXD88IdzS14F4NxAZudSmv https://www.youtube.com/playlist?list=PLlXfTHzgMRUKXD88IdzS1... Probability: https://www.youtube.com/watch?v=KbB0FjPg0mw&list=PL2SOU6wwxB0uwwH80KTQ6ht66KWxbzTIo https://www.youtube.com/watch?v=KbB0FjPg0mw&list=PL2SOU6wwxB... Calculus: https://www.youtube.com/user/professorleonard57/playlists https://www.youtube.com/user/professorleonard57/playlists Be sure to work through problems and not just watch lectures, because otherwise you'll forget the content. For example, the linear algebra course has a companion site with problems, and the professor of the probability course wrote an excellent book with problems.