... it perhaps is a good time to think about the input of schooling in development of these skills/knowledge base.
Furthermore, the social environment of school clearly impacts upon personal motivation, progress in the classroom, and if providing a suitable educational environment should contribute greatly to the development of the child, not only for 11 plus tests but also for success after entry to one of the Grammar schools (hopefully).
Hence, I am trying to survey primary schools and 11 plus results. I am very grateful for any help in the regard.
As the CEM test hasn't yet been taken in Gloucestershire, there are no results that you could link to a primary schools teaching. Even once there is data to be linked, you'd have to go to ask for that data from each Primary school and as Amber says, the primaries are highly unlikely to know which children took the test.
As for Okanagans suggestion about asking the Grammars, I don't really think it would prove anything. For instance, my children went to a primary with (in many years) a very high number of children passing the test. The head teacher was very anti-selective and absolutely nothing was done in school to help prepare for the test (all the schools energy went into preparing for SATS). The children passed despite
the primary school, yet the statistics would appear to show that they passed because
of the school. How will getting the schools to spend time and money producing those statistics help you?
Another thought is that a primary may have excellent teaching and have taught the children the curriculem correctly and fully, whereas the actual intake they have happens not to have any children in the top band bright enough to pass the CEM test. Your daughter could go to that school and pass the CEM where there's no history of passes from that school; conversly you may find primaries with quite a high percentage of their pupils passing the 11+, but in fact the school has not taught them particularly well - the children having prepared for the test by widely reading at home.