My dd got her offer at the school we applied for, hooray!
She was a bit vague about what she did but basically...
We arrived and we went into a room with toys, books, tea and coffee. Very soon a teacher came and took her away. We'd prepared her that this would happen so she looked nervous but went fine.
While she was away we (dh and I) got led away for a parent interview where they asked us about her interests and favourite activities, and what we are looking for from her schooling. It was maybe 20 mins but a nice casual friendly sort of chat, we enjoyed it.
She said she was asked to write her name (she's not very good at doing this yet, summer baby) and something like sorting out some tiles with numbers on, into number order (I think - might have been letters) - again she probably gave this a brave attempt but not accurately! She was also allocated a partner, a girl she'd never met, to play a round of hide and seek with, which I think she'll have done willingly. I asked dd if she did the hiding or the seeking and she said "Both! We took turns!" And she was able to tell me the other girl's name, so it sounds like she did OK on that.
We are so happy she got the offer. Hope this description helps anyone preparing for theirs.