I think the IB Diploma plus ECs is doable. My son commuted about 3 hours a day back and forth to school, did the Diploma program and was involved in a couple of pretty serious ECs, including varsity track, an outside drum troupe, the school’s scuba club. a couple of drama productions and a community service group - with the IB Diploma, it’s necessary to do community service and other activities in order to fulfill the CAS requirements. My son did not graduate with all 6s and he was really happy when it was over, but he did fine. I can’t imagine piling AP courses on top of what he did, however.