My guess is that less than 5% of european soccer players ever set a foot in College, at least in the biggest Leagues (UK, France, Italy, Spain and Germany). I only know two: Lampard and Iniesta. There might be a few more, but they are oddities.
If anything, a good player and good student usually has to make a choice at 18 years old: "am I good enough to bet my future on being a pro player and delay/abandon the College, or do I give up on being pro and focus on studying?"