Really don't worry about it, in my Adv. Garde we were not graded... it was more of a hands-on thing just so you can get an idea of what its like. My sculpture was very primitive and just really nothing worth showing off, but I did enjoy getting my hands dirty (errr, wet) and seeing what all the fuss was about.
Some people do take a liking to ice carving, and they tell the Chef that this class awoke a passion in them.
Wow, that takes a load off! I was worried about the ice-carving in my course too. I'm happy that it's more of a "hands on" experience than a graded module. I'm not sure how good I'd be at that. I'll guess I'll find out!