I've split your post off from the DIY Preparation for GL Assessment
as CEM advice is a different topic.
Hopefully I can point you in the right direction.
Patricia has started a new thread for DIY CEM Preparation
. This is Bucks thread but should be broadly similar.
It is also worth looking in Birmingham as they have had CEM tests for many years.viewtopic.php?f=11&t=30114viewtopic.php?f=11&t=14423
You can find Bexley specific information in the school section (from the drop down menu at the top of the page)Bexley 11 plus