Some of the academically elite FBS schools do a good job of getting football players who can graduate from those institutions:
http://news.psu.edu/story/333112/2014/11/04/academics/penn-state-football-graduation-success-rate-among-top-15-fbs
Stanford is second with a 99% graduation rate.
Northwestern is third at 97%.
Rice is fourth at 95%.
ND is fifth at 94%.
Duke and BC tie for 7th at 92%.
Vandy is somewhere below 87%.