Good luck! I don't think you'd fail on the questions alone, but good to have a basic idea of what you're talking about, or know where to find the answers - be familiar with what's in the a/c manual, without necessarily learning it all in detail. Your school also probably has an idea of favourite questions from particular examiners, and I'd have thought you'd know specifically who the examiner is by now if you're testing next week?
Jessie05, where have you been training/testing and do you have plans to retest?