The graduation requirement for the study of history is three years. Students should take World History during their freshman year. All students are required to complete Modern European History, generally taken during the sophomore year, and United States History, generally taken during the junior year. Electives for seniors explore particular historical subjects in depth, promote global understanding, and introduce social science concepts. With rare exceptions, students are not eligible to take these electives until they have completed Modern European History and United States History. World and Modern European courses offer honors sections, and United States History students can take AP history to prepare for the Advanced Placement test. Honors and AP sections of senior electives are also available. Students are placed in these sections on the basis of past performance, standardized test scores, teacher recommendations, and, when necessary, department-designed applications.