Each year I receive calls for help part way into the new school year from parents whose children signed up for too many AP classes. I usually can not help these students because my schedule is already full, so I wrote the following article to try to stave off these problems to the extent possible. This article is an update for 2019 of my experience with AP Science and Math classes. Most of my students attend Aragon, but the cautionary notes in this article should also be considered by those attending other SMUHSD schools.