Bathing Technical?

Hello! Baby groomer here. I’m getting sent off soon to get certified, and the details I got included the note that the first day is a technical test on bathing. I’ve never had any complaints about my work, but I’m terrified there might be something I mess up royally unintentionally. Can anyone who has been through it run me through the common trip-ups? I’m likely just being paranoid, but nervous. 😬 I know of course I need to do the 7pc, but anything that would outright fail me?