1. Study? For Nuclear Power? No, but for basic Navy knowledge, it would serve you well to know this. Get involved with you DEP Leader for this. You have a year, you have plenty of time to learn orders of a sentry, basic rank structure, uniforms, Navy terms, etc. If you went to boot with this knowledge you would be ahead of the game and probably find yourself in a leadership oppurtunity for your division. Eventhough your boot camp record won't follow you to Nuke school, your experiences and your leadership ability, does, which over time will make you into good Sailor and so on.
2. Exercise? Yes, plenty of running, push-ups, crunches, basically work on your calesthenics. Don't go crazy, but being able to run for 2-3 miles, 3-4 times per week would be good. Your DEP leader can help you.
3. Don't worry about nuke school yet. If you were smart enough to get into the program, you are smart enough to start Day 1 without any prior knowledge.
4. Don't forget to enjoy your civilian life now.
R/
MM1(SS) Sponge