Navy Diverr Training?

So I'm gonna see a recruiter soon but I'm about to enlist to become a navy diver. I know the physical training is very tough and I want to be as prepared as possible. I just bought a 20 pound vest to help work out and train in. I plan on using it on my runs, push ups, pull ups, and sit ups. I've heard you shouldn't use it everyday as well, what would you say? Im also gonna use it when I practice treading water to be prepared for treading with 25 pounds in training. I plan on training on swimming as well without the vest. Is there anything else I could do to help train for training? Also do you have any advice?