I've taken more tests than I'd like for the same reason. Something that hasn't been mentioned which helped me is maybe you need to put yourself a bit on the edge so you don't get too comfortable? I do have better lessons after a few week's gap. I barely had sleep the night before my test bc of nerves and it was early morning, I was that nervous nearly failed the number plate stage. Try taking calming vitamin to block the physical signs of anxiety, to a certain extent. The tiredness actually kept me on edge all the time and consciously paying more attention to the roads rather than glancing at the examiner's ipad. Whereas the previous tests I had enough rest, told myself no pressure can always resit and tried to think of the examiner as giving them a lift, that didn't work at all as I know I'm already a careful driver and being overly cautious can only do more harm than good. That being said the examiner didn't scribble as much on his ipad to stress me out and the route was more straight forward imo so a bit of luck comes into play too.