Extra school for exams

Final exams are coming up in less than a month. To make sure that all kids are prepared, students that are ranked 11th or lower in their class must go to extra school from 4PM to 6PM. The top ten students do not have to stay. This has made things very quiet around the orphanage in the afternoon, and it didn't take me long to figure out who the smart ones were. In three weeks when the exams are over, the extra schooling will come to an end and the kids will get a one month break.