As you may or may not remember, some crazy member here hadn't been tocuhing TKD for a year and was overly neverously when he comes back: http://www.martialartsplanet.com/forums/showthread.php?t=41798 Now, after been training for a few months, this guy gets to goto grading!!! But he is feeling just as nervous as when he got back, if not, heaps more nervous then a white belt, because the expectation would be much higher than from white belts!!!
good luck with it i'm sure you'll be fine, if you hadn't reached the standard you need to, you wouldn't have been put forward for the grading