VI and DrPixie are on the money.
IMHO, they will want to see how you perform flying their workcycles, procedures, etc.
The way that they fly the aircraft may well be very different to how you fly. They know this, and will be interested in how you adjust to their way of flying.
In any case, the advanced course you'll do around half your flights in a CAP10(tailwheel a/c). If you want to prepare, perhaps get some t/w time.
Suggest you also do some IF time in a flight school SIM.
Having said all that, your raw flying ability isn't the full determinant on how you go. Your attitude over the two weeks will be assessed, as well as how you go during the team exercises and the interviews. Plenty of people who fly really well get scrubbed during the latter part of the assessments.
There are a few threads on this in D&G. Suggest you do a search for more pointers.
DIVOSH!
(Disclaimer: I did my assessment in 2004 so some parts may have changed)