The answers to your final exam are as follows:
abbacadaba
As for your open water skills, take your time in doing them. After all, you are not going anywhere (except for maybe straight up?) Also, relax. You are there to have fun too. You have already done all the skills in the pool and it is really no different in OW.
Question: Is your OW in fresh or salt?
I did mine here in Puget Sound.....about 50 degrees, and to tell you the truth, just the fun and excitement of being under water, I never even gave a thought to the fact that it might be cold.