Sometimes students say this when a class starts a new unit. It’s cute. The implication is, “I got everything it’s possible to get out of Romeo and Juliet in that 7th grade class.” Not likely.
So you’ve read it once before? That’s great. I’ve read it 30 times before. And I’m still getting new stuff out of it.
This complaint is like someone going to a gym and, when their trainer says to do a push up, responding, “I already did one of those in 7th grade once. So I’m good.”