Hi Skybabe1975
First thing try not to worry about it, as you passed it last time you should have no problem this time. I went through the process a couple of times because I screwed up my interview. They told me to come back when I was more mature, well I couldn't wait that long so I went back the following year and sneaked in.
Spacial awareness is something you either have or not, you have passed it once so you sound like you have it.
Wishing you all the best for Tues and just think in a few years you will be using this forum to moan about WP and pay.