I haven't been through the ICT FSI Encore, but I've been through 135 297/293 stuff at other centers on the Encore.
Obviously know the limitations and memory items. Thats the main thing they will ask you. Its also good to know what is the cause of each annunciator, and what it means. So actually knowing the systems will help there. They will probably touch on some of the main systems, like Hydraulics, Pressurization, Electrical. Nothing to crazy, just to make sure you have a basic understanding. Like , can you run the HYD system on 1 pump? What is an open center system? Usually they don't go to far into specifics for initials.
As for the SIM portion, its all the exact same stuff you will have seen before. 1 Emergency item at a time, and then the standard low vis abort, v1 cut to a relight, stalls, steep turns, you'll do a circle to a landing.Then probably vectors to an ILS, go missed, lose and engine, can't relight, return for single engine ILS. Land, take off fly a GPS go missed, maybe do a zero flap landing. Most are pretty similar and you'll have already practiced it all.