State boards will tell you what you are expected to do and application deadlines. They may send a packet containing the Ethical Principles and relevant state laws. Some states may have allowed you to practice under a limited license or in a postdoc while you met additional education or supervision requirements. You would need to meet whatever requirements the board assigned. California, Colorado, and Texas are currently represented, but you may find the materials helpful for other states' orals as well.
People sometimes discuss state exams here.
Click on the link and follow the subscription information further down the page. I'll review them for possible inclusion on this site. Shoshana D. Kerewsky, Psy. This information is accurate to the best of my knowledge, but you should check with the sources of information listed for confirmation, updates, and complete descriptions. This page is provided as an extension of my opinions only and does not represent any point of view other than my own.