So for starters, one good thing would be to know the definition of probable cause. You say you know what probable cause is; they already covered that stuff in class. Well, I hope that your studies included not only memorizing the Miranda warnings, but also learning a definition of probable cause.
Still, you would be surprised how many times during lawsuits that I find the sued officer cannot give a short, succinct definition of what constitutes probable cause. How many times? Almost always!
Don't get me wrong, most officers can kinda tell you what probable cause is and get it kinda right, sometimes, but that is about it. Like the old Supreme Court Justice Potter Stewart's comment about pornography, most officers know probable cause when they see it, but they have a heck of a time defining it. And if you can't define it, then a judge and jury may think you don't know what it is and that your "ignorance" led you to make a false arrest.
Here's my favorite definition of probable cause: "A law enforcement officer has probable cause to arrest a suspect if the facts and circumstances within the officer's knowledge, of which he or she has reasonably trustworthy information, would cause a prudent person to believe, under the circumstances shown, that the suspect has committed, is committing, or is about to commit an offense." Williamson v.Mills, 65 F.3d 155, 158 (11th Cir. 1995).
If you memorize this definition, or another accepted judicial definition of probable cause, you will be light years ahead of the game.