At the end of "Game Night" (3x15), when JJ said "Izzy's going to college in New York," I was under the impression that meant she'd already been accepted -- I guess maybe he just meant that she had applied there as her "top choice" (as opposed to a "safety school," which I'm guessing the one she ended up getting into, Chapman University in Orange County, was), and he only wanted to apply there so he could have a chance at it too.
But anyway, damn, this one made me cry!
So JJ did get into NYU after all, but he decided he wanted to go with one of the other schools that accepted him closer to home (University of California-Irvine) -- which prompted Izzy to break up with him because she didn't want to hold him back. The first part that really got me was his conversation with Maya right before he had to go give the speech for his graduating class:
And then the speech itself -- which JJ finally did get around to writing but decides to scrap when Kenneth, Dylan, Ray and Jimmy get too emotional trying to read it:
As for the rest... I thought the Dylan/Jimmy plot was a fine sequel to their pairing in the s.2 finale: There, he realized it was better to be open and honest with her, including about his disdain for his job; and here she says she's proud of him for landing an interview with an architecture firm (scheduled a month in advance, which seems unusual to me, but I suppose they figured he would need all that time to design and build a sample project).
And of course, Ray's side-plot was funny (I like how one girl bluntly says, "You got too tall too fast" xD ), but his vulnerability with the girls in his Junior class (after they accuse him of being "so busy trying to get us to notice you, we don't get to know you") did something better than merely get him a date -- it opened the door for them to want to help him (since deciding to work on himself at the end of s.2 ultimately didn't come to much).
Choice cue: M83, "Outro" (2011) (during JJ's speech, and the closing tag with him in New York)