Dear Twickers W12
Firstly welcome to the forum.
Tutors cannot be named on the forum as that would be deemed as advertisng, which is against forum rules.
With regard to the process, some parents and some tutors would like to make you think there is a secrecy but that was put to rest by this forum some time ago. It is 2 tests. One Verbal Reasoning and one Non Verbal Reasoning. Both produced by GL Assessment.
Should you wish to DIY then the forum is a wealth of information, I can point you in the right direction for VR as they use the common 21 types of questions.
Take a look at the Surrey section, further down the front page of the forum, you will find some more information regarding the testing.viewforum.php?f=30
Good Luck with your venture.