Never hurts to show interest.
I'm amazed it is thought 6 year olds should be sitting papers anyway. That said, in my day the primary school teacher didn't really have a handle on us really. I recall being in one reading group for ages, not realising I, a small insignificant pupil, could complain about the books given us to read. Until the day I got so fed up I called out every word one of the others in my group was stumbling over during the 'read out loud to teacher' bit. Before the end of the day I was offered the book the top group was reading, but to be honest, it didn't seem that much more challenging. Childhood memories eh? I suspect it doesn't much matter, they are trying to drag the whole class along at the same pace. But ask anyway; keep them on their toes.