CouthyMowEatingBraiiiiinz
"I agree that it's possible to be at a lower NC level at the end of Y4, and to have a developmental leap in Y5, meaning that you are capable of gaining a place at a superselective GS in Y6.
I don't think that a DC that is lower than level 4a at the end of Y4, that makes expected two sub level progress in Y5, is likely to get a high enough mark to gain a place at the start of Y6.
At least, not without intensive tutoring."
May I be like letseatgrandma and politely disagree with you, without my sounding like ?my Dad?s bigger than your Dad? 
DD was Level 4c Maths, 4C Writing and 4B Reading at the end of Yr 4 (teacher assessments, not exam-based) She made no huge leaps in YR 5 and infact went backwards slightly, under some ?interesting? teaching methods. It was only with my help that she got back on track.
Like letseatgrandma?s DS, she scored 355+ for a superselective in Colchester without being intensively tutored. I too would hate parents to think it can?t be done unless you have stellar SATS/NC levels at the end of Yr4
We should all remembers that SATS/NC levels only give a really loose idea for the needs of the 11+, as they cover/test entirely different things
We were informed by the HT that the levels were, in some curricululm areas, based largely on the teacher's opinion, rather than a test result and that some teachers could allot marks that could be too high or too low! These NC level limitations are especially relevant for Essex.
DD?s now working at Level 6 throughout.