Hey just read the letter properly and it is on the 21st!!! How stupid of me.
I have a friend who works for virgin at the mo (Based at MAN) he remembers the tests during training to be managable, he said that you just need to over do the reading as you won't know what kind of questions they may ask so you should know the material back to front. Other than that you can't go too wrong if we work hard at it.