Oh, you've already done Biology, okay. [ she probably shouldn't joke like this with people that she doesn't even know, people that aren't Peter, but it comes up before she really things about it. she's grinning though, so it's obvious she's being a smartass. ..well, she hopes it's obvious.

this is it, this is how Gwen Stacy loses her new friends the same day she met them. ] So you've already learned all there is to know about Biology. That's- kind of incredibly, actually.