It is last for a 3 year period because SJU had a 900 last year. They actually had a 1000, perfect score, for 2012-13.
It is a phony stat. It has little to do with actual academic excellence.
SJU was hurt 2 years ago when Harkless left early and withdrew from school thus costing them 2 points for retention and staying in line to graduate.
With a limited roster (remember they had like 6 scholarship players 2 years ago so they had limited total points) that hurt them for that one year thus dragging down the overall 3 year moving average score.
You could have 8 phi-beta kappa’s and 3 kids leave early and withdraw from school before Spring Semester ends and you will get hurt badly with your APR. In other words you could have the highest cumulative GPA in the NCAA’s with your kids taking Chemistry, Law and Pre-Med classes and your APR would still be poor.