This video highlights the key topics in AP Calculus AB.
Note: the 2020 AP exam did NOT cover distance traveled / displacement (in this video), area between curves, volume of solids generated by revolutions, or volume of solids with known cross-sections (not in this video).

Link to Google Slides with correction: https://bit.ly/2yzG6XR
Regarding the error with approximations: heed my advice of drawing a picture so you never have to "remember"