Asked us questions in a room with small groups. Then came another day to do paperwork and take badge photos After that my manager set us up on w2w and we got to work when we could

It's fairly laid back. Dress business casual, and be confident. They hire a lot of teenagers for summer employment, so they're used to it being people's first interview. They will probably ask you a brain teaser; don't stress about the reply, just come up with something.