Even if someone replied about their experience, Id guess robinson will have a decent question bank and experience will likely vary year on year. Stat and mech stuff is generally fair game, and from the step stuff they ask about transformations, unusual settings, ... to which simpler/standard techniques can be applied if you understand the approach. So Id guess theyd be unlikely to do a traditional a level circular motion question which ground through the trig/algebra, but they could do a projectiles question (for instance) where a transformation/rotation at the start simplified things or a circular motion one where the object leaves the circle and goes to projectile motion (there was a decent isaac question like this) or ... So something which gets you to think / discuss about approaches.