I had had 7 hours previous flying experience, thought I hadn't done too well and passed. I think like PAJ says, they're looking at how well you can pick something up and repeat it getting better each time.
They may also throw a few random maths questions in there while you're trying to fly just to make sure you can multi-task.
I think the best advice is just to go and enjoy yourself, listen and learn. I thought I'd messed up on a few things, but I passed, so I don't think they'd expect you to be a skygod just yet.
Also the lower display on the screens was for my assessment, set up as per the bottom photo in Kerosine's post above.