My kids did Shirley mocks with the company based there and Walsall exams because we were considering those schools. I thought the Shirley mocks were well managed and helpful for pointers for areas of weakness for my two older ones (who needed a push) and also helpful for my youngest, who is very able. We were confirmed in our decision to give up weekly tutoring for him as he scored a 'safe for Camp Hill' score in the Shirley mock in March. He also took one in May. He did score safely for Camp Hill in the actual exam. The numbers now taking the Shirley mocks and the records they keep mean that they do have a good idea about how the scores in their tests represent a likely 11+ score.
Agreed with Turtegirl! We sat one with K*** based in Shirley. I was quite impressed as it was well managed and organised followed by a detailed feedback report. My personal opinion is that it was set at a much easier level than the actual CEM test your child will sit (except the Maths element in the past two years). However, as almost 10% of the Birmingham cohort ends up sitting this Mock in Shirley you will get a fairly good idea of your child's chances based on their rank.
The final rank of my DS pretty much reflected the rank he achieved in this mock.