We are moving to the Gloucestershire area (Cheltenham) so, as I understand it, he needs to prep for the verbal reasoning test. (For the fall of this year.)
Hi, I'm only replying because no one else has and I am not going to be any use to you on the specifics of preparing for the exam. I just wanted to make sure you knew that firstly, there is no compulsion at all to sit any exam - it's only if you want your child to go to a selective school (there is just the one in Cheltenham) - most children do not sit an exam and if you are happy to use a non-selective school there are plenty of good ones in the area. Secondly, have you checked residence requirements? My DD has some American friends who were not allowed to enter the state system as American citizens and had to go to independent school. I'm assuming you must be planning to stay in the UK and maybe you or your child has citizenship here in which case it won't apply but there are some rules I think - I also taught a girl from another country who faced the same issue and had to go to private school.
I'm sure someone with better knowledge of preparing for the tests will come along to advise soon. Good luck.