12th graders queue to enter the High School Affiliated to Renmin University of China in Beijing on Monday, the first day that city schools reopened. Photo: Wang Xintong/Caixin Global

A school staffer disinfects the ground at the main entrance. Photo: Wang Xintong/Caixin Global

A student wheels his bicycle to a side entrance of the school. The school set up extra entrances to prevent crowding. Photo: Wang Xintong/Caixin Globali

A student shows a school staffer a QR code verifying that he is healthy. Photo: Wang Xintong/Caixin Global

A 12th grader walks to school accompanied by a relative. Photo: Wang Xintong/Caixin Global

A school staffer gives directions to a student. Photo: Wang Xintong/Caixin Global

Students prepping for the college entrance exams haul luggage to the school to help them carry their books. Photo: Wang Xintong/Caixin Global