If you are in graduate school, you only are only eligible for the lifetime learning credit. I know the questioning asks if you completed the first four years of college. Technically this means if you competed your freshman, sophomore, junior, and senior years than that is your four years of college. You just happened to be a bright individual that completed these years in two years rather than 4. Unfortunately though, this will not qualify you for the American Opportunity Credit and Turbo Tax mentions this in the program stating that 4 years means if you competed your freshman, sophomore, junior, and senior years and not 4 calendar years.