From what I've seen, hard to fail "only" because of the sims. The way the exam is structured, if you've done very well on the mcq's, then you need to pick up only a few points more from the sims to pass. And a good 10 points is the communication- so doing well on that definitely helps.
I really don't have a good answer to your research question- I don't think I was able to nail those- so just selected what I felt was the closest. But I believe the research tabs are worth just a couple points- so I wouldn't worry too much about those.
Good luck!






