Confidence...
When I first started learning my confidence wasn't very high, especially during hill starts and judging when I can pull out at Junctions and Roundabouts. Now I'm at the stage when I can book my practical I feel like my confidence is becoming a bit of an issue, I'm over confident. I can judge things very well, I can do my maneuvers well, my driving is fine... but this potentially makes me a slightly more "aggressive" driver, which might not go down so well during my test.
What I'm trying to say is that I'm not as cautious and timid as I once was, which could be an issue during my test. Hopefully the nerves of taking my test will bring me back down to Earth and stop my over-zealousness, hopefully.