Ashley, this was my question as well. IF one is switching to private school which allows major acceleration it looks like it is a one way street, Not clear how one switches back to public school when they do not allow AP classed in freshman/sophomore year.
In some of the highly rated public high schools in my area, there are complaints that students have been allowed to skip levels in math but had to repeat biology, chemistry etc. to meet the PS prerequisites for AP sciences. Parents have lobbied with the school districts, gone to the local press etc. So, it depends on how the local public schools handle the issue (perception of unfair advantage to some, lack of post-AP level offerings are issues). In my opinion, high levels of acceleration in private schools will result in some repetition and time wasted in public high school. I don't understand what Dual Enrollment and Community College options might mean to such students. Maybe someone with knowledge on that topic will reply here.
