The point was the high graduation rate at ivies is primarily driven by the stellar academic students of the incoming class. A high graduation rate at a college where essentially nobody in the class is expected to fail is not good evidence of it being “very difficult to fail” at that college. If HYPSM… started admitting a large portion of the class that were C HS students without rigorous schedules who were in no way academically qualified, then then it would suddenly appear to be quite easy to fail, with a relatively low overall graduation rate.