Probably a dopey question but what sort of factors/problems do the majority of failed candidates encounter that trip them up? Is it an inability to cope with the stress of busy scenarios in the sim, or more a technical or knowledge based issue that could have been prevented with more revision/effort. I've recently applied and though I'm reasonably confident that perhaps I meet a lot of the requirements on paper, just working out for myself wether I possess that 'x' factor we hear a lot about on here. Maybe impossible to answer I understand, but would be interested in any thoughts.