Hello,
I took the RT Practical 2 weeks ago. I was offered either route 7a, 8a, or 9a and was then briefed by the examiner and given 25 minutes prep time. My advice is use this very wisely. There is a lot going on so make sure to have a list of frequencies, or perhaps make your own blog to make things easier.
When you're ready you will be shown how to use the computer. This is what I found most difficult to be honest. All of a sudden you are trying to use the computer, use an unusual call sign and put together all of your RT Skills all in one go.
I thought it was quite fun, if you dont know already, learn the following;
AG Radio
FISO
Class D Dep/Arr and Class Zone Transit
MATZ
QDM's
PAN and May Day Call (these must be perfect!!!!)
Diversions.
Imagine the flight from hell and you'll be close. I passed, but on reflection thought the only way I could improve would be to know how to use the computer before hand. I have my XCQ next month all exams passed.
Hope this helps :-)