Usabo studying

<p>Hello my fellow ccers.I am currently a freshman studying for the usabo. I am just wondering, is there anybody that took the open exam 2011 that could give me advice on what to study for the 2012 open exam, do I have to study ALLLLLL the charts and the graphs for the open exam. My goal is to just pass the open exam this year and then next year advance past the semis. Any websites, practice exams, etc.... would be great. Thank you!</p>