it might be per district/school, but I know for a fact it was required by my HS to take a drivers ed course, either privately or in school to graduate.
"Each student must pass the classroom portion of Driver Education in order to graduate high school."
http://www.d214.org/educational_services/driver_education_program_.aspx
Mine was also required; it had something to do with the safety crap in the classroom portion. We had a blind kid in our class. No joke.