Just in case you didn't notice, the guys on this board are big on looking stuff up for yourself and only asking very specific questions when you can't find your answer through the Search feature. But hey, thats all part of being a nuke, learning how to research and find stuff out.
As far as being nervous goes I would stop worrying about reteaching yourself calc and physics, they are going to hammer it into your brain for the next year and a half.
How are you doing physically? I would be more worried about boot camp than power school if i were you, you're scores are above average as you probably already know, so as long as you have the determination, you will be fine. Make sure you're in shape to make it through boot camp or you won't ever have a chance to use all that knowledge.