I was actually told by my instructor: "If you do something wrong, swear under your breath, but loud enough for the examiner to hear. They'll think 'That person knows they've made a mistake, let's not be too harsh on them..." Like that worked...
You're only really likely to have any majors if you don't think. Pulling off in third and stalling - that's a major. Going on to a roundabout and almost being rear-ended by some **** who doesn't indicate...that's a major. Not taking your time and judging things at junctions - major. Almost hitting a bus - major. The list is endless.
Stalling, slightly messing up any of your manoeuvres, going just a bit over or under the speed limit, doing a crap emergency stop, not "feeding" the wheel correctly - so long as you can recover, or do well in other things, these are only minors that they'll put down to "anxiety".
Examiners in school exams are told to mark you based on what you do well, given the time frame. I've seen crap essays, that'd I'd have given a D, been given an A. It's the same with driving, they can fail you based on something huge, or something little if you really mess it up, but they won't fail you for no good reason - especially at the start of a test, when you're most nervous...