Why did the postgraduate entrance examination cancel the plum blossom roll

For the fairness of postgraduate entrance examination. 20 18 was cancelled in the whole province of China due to the difficulty of post-examination management and the inconvenience of unified management. Plum blossom roll refers to the fact that the students who take the exam use different papers, or the candidates in the same examination room use the same content, but the order of papers and topic options is different.