I realize this forum is quite old, but I think input is always good in case someone else stumbles on it as I have.
Be prepared to answer scenario questions and try not to observe what the board members are writing down, that will just throw ur head into a twist as to how your doing. Focus on your answers. Use your problem solving skills to reason through the scenarios using common sense. There will undoubtedly be a question that puts you in a moral dilemma, ussually a question on Community Oriented policing and then a section to describe yourself. The biggest tip I have is to be confident in your answers. Be honest. Remember they are looking for real people, not infallible people.