There is not really a test for AO or SRO that you will be able to take coming out of the Nav...
Prospective AOs will be screened by the POSS test, and then possibly interviewed.
SROs are tested by the NRC after a really grueling training program - search the site for these terms and others, read a lot. Look for Broadzillas posts on the SRO subject - he's one of the smartest we got (humble SOB also...

) Instant SRO is a rare thing - you gotta be special. BZ will imply you are qualified to be a janitior unless you really have top notch training, quals and work ethic. He may be right.
Stumble around the various topics for a while. PM some of the knowledgeable posters (I'm not one of them - I'm not Nav, or Ops). Don't start a new topic every time you got a question.
Read the following and the FAQ for a starting point.
http://www.nukeworker.com/forum/index.php/topic,4219.0.htmlGood luck...