DD seems to have been spending a lot of time this year helping other children. When I asked why, she said it was because they couldn't read/didn't understand the questions, so she and a couple of others had to help them do their work. Apparently this was because they'd done the work ages ago, so already knew and had to explain.
The odd occasion I wouldn't mind too much, but is this the sort of thing that's going to happen throughout the school now? She even had to miss play time to do her own work once because she'd been helping someone else!
I have this gut feeling that this is the whole in depth knowledge/mastery of a topic thing!