Get a sense of how hierarchical their view of their peers is - and, if they are open enough, how they think about themselves in that picture. If they dont have all the expensive jackets and shoes, unpack how that affects their interactions. Have they even been in a distinctly expensive house, or a poor household? Ask if they know anyone on sports teams, or anyone in the art department, those who were homeschooled, are highly religious, etc. - try to get a sense of where they have gravitated and where they have animus. Do they view social butterflies that go between cliques as inauthentic? What happens when they see the odd-ones-out get made fun of? Careful there especially, but that is kind of the crux of it all. Treat it all like it was your career and you were angling for a promotion or to not be fired, but are pulling your hair out from stress and imposter syndrome.

Just do all you can to get ahead of the idea that they are in a concrete hierarchy, because make no mistake, they are in a hierarchy. Maybe even talk a bit about guanxi, and how people that freak them out now, will change a lot.