I'm going to be a freshman in college this fall, and I've forgotten a lot of Calculus because I took AP calc AB and BC junior year of high school. Also, I took Calc 3 in the fall of senior year and once again I've forgotten a lot of the content. What do I have to review to ensure I don't die taking differential equations, linear algebra, and possibly modern linear algebra? Any workbooks or physical resources I could buy?

tl;dr: what do I need to know before taking diff eq and linear algebra?