What if you fail any portion of NAVY bootcamp; can you retest?

I'm not sure about the navy, but I ume its got to be pretty close. Their are only two things you can fail in Navy boot camp that would hold you back, physical fitness, and knowledge. If you fail either of those you will be dropped from your platoon and but into a special platoon where you are brought up to standards. Anything else, they will work with you on the spot until you get it right. For example, swimming in the Marines, we had people who had no idea how to swim, they were brought to the pool everyday until they were the best swimmers in the corps.