5. When Caroline helped Max finally get her high-school diploma
Even though they'd been friends for a while, it took three years for Caroline to find out that Max never got her high-school diploma because she failed show up for one last exam. Sad to see her friend miss out on that important academic accomplishment, she rallied the rest of the troops at Williamsburg Diner to pitch in and help Max nail that final test, which she did, making her a bonafide high-school graduate.
"And the First Degree" (Episode 23, Season 3)