Andy, lots of good advice here already, and I echo the congrats on making such rapid progress. I suspect as others do that the examiner probably does get a feel of whether you are OK quite early on.
One comment about nav: trust your judgment and the system. During my test I made an unforced error through doubting my own nav. Briefed by the examiner to fly to disused airfield X as a waypoint, I convinced myself that disused airfield Y, which I could see some way off my track, was X and that I must have wandered off track. I made an unnecessary track error correction and arrived at Y, which I then positively identified as Y, not X (so by now I was not lost but was in the wrong place). I told the examiner what I had done, and that I proposed to return to the point where I went wrong by backtracking. This I did and the flight continued to X without further ado. This was a case of thinking it looked wrong when it didn't.
Very best of luck.