An ACC is a special activity.
It may modify HCA/HPA but not necessarily.
What is good in an ACC is generally taught in HPA/HCA sometime.
HPA/HCA is a tougher course by far and must prepare a student for all eventualities.
Thus HCA/HPA must cover all types of processing and theory.
Clearing a student is not in the province of HCA/HPA. Teaching how to clear is the emphasis. If they get clear it’s incidental.
They’re all auditors in HCA/HPA.