The Washington Post reports that because sections of Advanced Placement tests taken around the world have been lost, students must decide whether or not to retake their AP exams. Tom Ewing, spokesman for the Educational Testing Service, which develops and scores AP exams for the College Board, said the number of affected tests was “in the hundreds, not the thousands.” Ewing said that some exams were missing the essay portion, while others were missing the score sheet for the multiple-choice section…