Also Stanford University-Level Online (ULO) math classes, I think about $1,500 each class (semester classes). I’ve heard from students who were pleased with the classes overall, I have a student considering this option for next year. If your school proctors the exams you can earn HS credit, and you earn Stanford Continuing Studies credit which might transfer. You can go through the classes at your own pace as long as you take the exams on their schedule.