Firstly welcome to the forum.
The Tiffins VR test is no different to any other area using GL Assessment as their test provider. It is one test using 12/13 types.
These 12/13 types can be any one of the normal 21 types as uses by Bucks.
It has been known that occasionally Tiffin have not used any of the 4 maths types, therefore more of the vocabulary based type questions would appear. However I would not recommend assuming that this is the case every year. The 4 maths are relatively easy to master.
For publishers that cover the 21 types, take a look at my second post in the following thread.viewtopic.php?f=12&t=4782