First, the whole teaching building is classically shielded, and there is no signal from any mobile phone.
Second, there are two cameras in each classroom of the teaching building of Beijing Sport University, and the monitoring room monitors in real time.
Third, every time the invigilator changes, the teacher himself doesn't know which examination room to invigilate.
Fourth, the patrol exam has been patrolling. Once cheating is found, the test paper will be invalidated on the spot.