Gilbert Strang's lectures are indeed very good. I've got a textbook on Linear Algebra written by him as well which is very good too. As I said, reviewing mater

Gilbert Strang's lectures are indeed very good. I've got a textbook on Linear Algebra written by him as well which is very good too. As I said, reviewing material will probably lead to insights you haven't had before. If you've got spare time it's always a good idea to read a book on a topic like algorithms or a math book in order to get a deeper understanding, even if the book is just repeating things you already learned.