...has virtually eliminated the practice of attending class first semester and blowing off the second knowing one was going to enter the draft.
The explanation is linked below. Essentially, the athletes have to perform at a base level every semester they're enrolled at a school. If they ignore second semester classes and fail them, it lowers the APR score and puts tournament eligibility in jeopardy.
It takes academic fraud to give passing grades to athletes who don't attend classes, and that has its own peril... eventually.