... when Vinnie had to take a test that was crucial for graduation. If he didn't pass, he wouldn't graduate and he'd have to stay back another year (as I remember he failed it twice before). He crammed for the test and got a passing grade. A "C". Kotter praised him like it was a big deal, and Vinnie swaggered around the classroom like he was the smartest guy in school. Yes, he was really proud of that "C"...