It's funny, every time I finished one school the instructors/ other students higher up would say the next one was worse. Powerschool said the Prototype was awful, Prototype said that the boat was worse than anything in school, and the boat (specifically my chief) says that real life is worse than anything in the navy. Strangely enough, what was hard for one person isn't always hard for another.
Here is a quick tip for you. A-school is very book intensive. you learn theory about a specific job in relation to the nuclear field, Power school is also very book intensive except you learn general nuclear theory and principles to carry forward. Once that's done, Prototype is very personality dependent. you are standing in front of someone telling them what you know about a topic, this is called a check out. I can't tell you how many check outs I said absolutely everything wrong just about but they signed my qualification card anyway because I made them laugh. It all depends on how social you are with a mix of what you know and how good of a judge a character you are on who to get check outs from. it's definitely more of a social game and less book intensive. and the boat, is almost primarily social skill dependent. On a boat, they want you to qualify. it helps everyone if you do, it helps you, it helps your division by you standing watch, it helps your department, by you qualifying on time, and especially the boat as a whole. If you are social and make it past the first 2 schools you are good to go.