E Coli on "How hard are the actual FAR sims?"

Hi guys, :-)
I am studying FAR with Wiley Text and TB. I have an accounting degree and I found Wiley's FAR sims super easy. Each sim takes me like 3-5 mins to complete. This gives me a really strange feeling because my previous experience with AUD sims was terrible and I don't think the difficulty of these FAR sims matches those on the actual exam. I don't want to underestimate the actual exam so I really want to know how hard a REAL FAR sim could be, comparing to Wiley's sims. Any experience?
Thanks!