@RichInPitt - love the “sodoku/oragami”. Totally nailed it!
I still do a little of this for my DS in college. As you get to upper level classes, the number of sections dwindles. Also, they start offering them only in Spring or Fall, but not both. This requires some strategizing and long term planning. I put together a couple of scenarios for my son to start with when he build his schedule. I’m not telling him “here is your schedule”, just here are some options.
@HankCT - we ran into the same issue with AP classes and band. My twins skipped AP Chem because it was only offered during the band class slot. It seemed like a poor choice by the school. Band tends to have a strong cohort of AP students, so why force them to make that choice? Good luck. I agree with the sentiment above, get some physics, even if not AP over the AP anatomy.