<p>Last year, my S had a similar situation in APUSH. When he went to take the final, it was a test released online that he had used to study, he told the teacher before answering any of the questions, so S was excused from taking that test, but needing to still take the final, the teacher found plan B test. Well, oops, that one too is one that S had used for studying. The teacher had him go ahead and use that test though.</p>
<p>The key was to be honest from the beginning and admit that you are familiar with the exam and its answers.</p>