This is from an earlier thread and appears to be a fair representation of the sim check.
"The sim was quite complex (in my humble opinion). It was in the 737 300 and consisted of take off and climb to 5000', level off and accelorate to 250 kts. Steep turns, one at 45 degrees bank and one at 60 degrees, then descend and level off. Engine failure to deal with before vectors to single eng ILS, go around to 3000', the engine is then restarted and further vectors to 2 eng ILS to land. All completed on raw data, no fligh director or automatics.
It was hard work in the sim, but very enjoyable. No knowledge is expected (except of flying of course). There's a very thorough briefing beforehand. They're just looking for your ability in general, not 737 knowledge."
The sim check is conducted by GECAT for Channex to ensure an unbiased opinion.
Good luck
