yep dd4 just like this - mostly I go round thinking she doesn't know anything! Then for eg, at music the other day after not practising (another battle) she plays everything perfectly, when they learnt a new song, she played it once quietly before they were supposed to. OF course when the whole class played she literally couldn't play it - I quizzed her on it after and she said, well I can't play it that slow.....
She also had a meltdown at a new chess club when instead of saying she knew something to the instructor she sat there taking all the old info in - being 4 I though maybe she didn't really know it all and good for her for listening again. Well she cried all the way home because it was not very exciting to practise stuff she already knew and not play any games.
