I have seen your question in the Wirral section and then in the CEM General section.
This may not be of any particular help, but just to say that Birmingham uses CEM, and that the Birmingham forum is generally quite busy and often a very lively one indeed. There was a huge amount of discussion both prior to and following last (2015) September's CEM exam, and during the 6-week wait for the results. You might be able to find some useful information while having an interesting read!
I have no idea about possible regional differences though.
Wishing you and your DC all the best!