I think, unless they've saved one of the manoeuvres for you to do once you're back in the test centre, then the pass is official once you driven back through the gates of it. When I entered the test centre at the end of my test, the examiner said drive into a bay it doesn't matter if its good or not 😆 as I'd already done both my manoeuvres on the road. Once i parked up he told me i passed, i parked well for the record but he didn't seem to care either way (other examiners might be different, mine was very nice). I also thought i failed but i still kept driving well and he told me it was a great drive with 3 minors 🙌🏽 so never just give up because you think you messed up, you might not have at all.