Pilotnik,
A friend of mine did his MCC on a turboprop and he went to the Ryanair assessment without ever seeing a 737 sim, not even on Microsoft flight simulator, and he said he felt completely lost inside the sim.
He also said that most of the guys at the interview had done Oxford's MCC which trains using Ryanair SOPs. Other guys I know who have gone to Ryanair who did not do Oxford's MCC have rented a 737 sim with an instructor for a couple hours before going to the assessment.