Per Michael Eric Dyson, Cosby:

Dropped out of HS after failing 10th grade for the 3rd time

Got his GED in the Navy

Enrolled at Temple, but dropped out to pursue his show business career

Was granted his Bachelors for "life experience"

Apparently, he didn't take any classes for his doctorate and had Fat Albert writers pen his thesis

http://www.people.com/people/archive/article/0,,20092196,00.html

http://www.deathandtaxesmag.com/232722/fat-albert-writer-bill-cosby-paid-others-to-write-his-ph-d-thesis/