sorry, necessary issue of swear word coming up: B*****ks!!! and, further warning, this is one to bring the baby out on, methinks.
Really, the year 2 child is just a tiny thing still. Let your daughter be young and play - you know that mad, old-fashioned thing kids used to do. Make sure that she keeps up, that she reads or is read to and play the odd game of scrabble or mastermind or pontoon (adding up). And change your friends! Private school does not equal cleverer by the way so don't assume that they're all on a fast track to Oxford and that this attainment is set in stone by the time they are 7.
I'm not in Essex, but in Glos we only have grammars which are selective on the basis of mark. No siblings, catchment or anything. So, it's tough round here, too.
Year 5 is quite soon enough!!
Well said Milla!!