Hi LDmom,
Thanks so much for the response. You make some good points. We are also not interested in HS credit at this point, but were trying to find material that would suit him. One aspect I like about the curriculum in the HS class is that the questions in the assignments show him broader ways to think about issues. I do see some benefit of the actual curriculum for this reason (also showing him how these higher level courses function with syllabus, assignments, projects, and tests).
I was wondering if people found a solution to this gap.Thanks again for your response!