The first step in preparing for the exam is to download your bibs or bibliography. Bibliography are references for the exam. There are many online references for which you can download. Some sources though, mostly classified and military manuals are not available for download.
After downloading the materials for the preparation, you will need to gather all Navy advancement material then enroll at the NETPDTC (stands for Naval Education and Training Professional Development and Technology Center) your NEVEDTRA (stands for Naval Education and Training Command) courses. When finished in enrolling in the course, a printed copy will be went to you.
The site called NavyAdvancement.com has an available bib, which is short for bibliography reference page, rate specific page and Professional Military page.