Which bit of 'selection process' are you referring to? The bit you have to do at home first or the bit you do once you haul your @r$e to SIN and smile sweetly?
Because you said sim I'll presume the latter. The sim is straightforward like any other reasonable airline with reasonable examiners - visual circuit work, handling skills, some basic IR and of course OEO handling - nothing exceptional. HR on the other hand is quite something else, but it's Singapore so I shouldn't be surprised.