A little advance warning for schools taking Advanced Placement exams: make sure to remove student projects from the classroom wall.
Penfield High School made the mistake of leaving a student project from an American history class pasted to the back wall of the classroom on the day juniors took an Advanced Placement exam in American history.
The result: 53 students must take the exam again if they want to earn college credits.
The exam they took in May was recently invalidated by the Educational Testing Service, which oversees Advanced Placement exams.
The posted report was a time line of historical events. It could have given students an unfair advantage over other students taking the exam, the testing service ruled.