I wish you the best of luck buddy!
When I was in school getting my associates in baking and pastry, we had 3 major comprehensives we had to pass. In each comp, there was a written portion and then we had the practical portion (which would be the baking part). For the first comp, I failed the written once so I had to retake it again. The test was given on computer and it didn't add up the answers correctly, so everyone failed that one.
For my second major comp, we had a sweets table event and we had to work in partners for this. Each person had to make petit fours (bite size desserts) We only had 8 hours to do five categories. Some of the stuff like puff pastry takes 3-4 hours alone. All of the stuff we made was put on our table and people from school and our family members were allowed to come in and taste what we made. I passed that comp with flying colors.
The last comp before we graduate was the biggest pain in the ass. We had 8 hours to do 2 categories. Those categories are decorate a wedding cake, make a sugar sculpture, plated items, chocolate confections and one more thing I can't remember. Each category is a pain in the ass. Not one was easier than the other. Each came with its own challenges. I chose wedding cakes and the sugar sculpture. When we were to be graded, we were to get graded by every chef we ever had, which 7 chefs. We were graded individually as well. That was one of the most nerve wracking things to go through. My sugar piece shattered before it was graded but my chefs saw it before it broke and I passed that one. My cake had to be redone because of a minor flaw, The chefs were extremely picky and almost everyone had to come in the next day and redo something. When I finally passed, I felt so damn good.
You'll do fine, just breath and concentrate.