The Job Task Analysis (JTA) is the blueprint of what is covered in the exam.
Identify your strengths and weaknesses.
Review each exam domain and task, and identify areas where further learning or experience is called for. If you feel confident in all domains, you may wish to take the Pre-Test Assessment (see step 4) before studying specific areas.
To find a link to the JTA for the exam(s) you are interested in, start here and select a certification.