Before the exam, the teacher in the examination room drew lots to decide which set of papers to use.

Before the exam, the examination room teacher draws lots to decide which set of test papers can effectively prevent the test papers from leaking.

In some examination processes, due to the separation of teaching and examination, in order to successfully pass the examination and get the examination questions in advance, candidates will buy off several invigilators or examiners to get the examination questions before the examination, so the organizer will ask the examination room teachers to draw lots to decide which set of examination papers to use before the examination, so there is not enough time for cheating candidates, so it can effectively prevent the examination papers from leaking.