AP Computer Science, at least as I remember it, was more of a Java programming course than a theoretical CS one.

And at my high school there was extreme variance in everyone's programming ability, which led to very little lecture time and mostly self-guided study.

Given that, there's probably some YouTube series with exercises that are more informative and enjoyable than most CS high school educators. Add in GPT-4 to answer the questions and let kids collaborate and you'd be set.