Sometimes it is maturity. I made a D in the 2nd Principles of Accounting class in college. 10 years later, I got a degree in Accounting with a 3.5 GPA.
I had to re-take the 2nd Principles class. On the first exam, the students demanded a curve because the test was so hard. The professor asked “If it was so hard, how did someone make a 98?”. Everyone turned and looked at me because I was wearing a tie. “Hey, this is my 2nd time”
LOL! I can just see it!