Fergal,
It shouldn't matter what SID you are asked to use! A SID is a SID is a SID.
To prepare for a SIM check, concentrate on your IF. Make sure your scan is super fast and you will be fine. The instructor is looking for you ability to learn quickly and interaction with your sim partner, he wants to know if you will make it through the type course.
Don't concentrate on any one SID then whatever one you get you will be just be able to fly it. I am not saying dont be prepared, you should be but if your scan is good you will do alright.