According to Article 9 of the National Postgraduate Admissions Examination Room Rules: Candidates should stop writing immediately after the exam end signal is sent. The test papers and answer sheets for the nationally unified subjects are placed on the table and collected one by one by the invigilator. For self-taught subjects, candidates must put the test paper, answer sheet, and answer sheet (or answer sheet) into the original test paper bag and seal it. Only after the invigilator has verified that everything is correct one by one can they leave the examination room one by one.

The reason why you are not allowed to leave with the test paper is clearly stated here. It must be put into the original test paper bag and sealed. This is mainly because:

1 To facilitate the teacher's marking

2 To prepare for various reviews or archives, so that it can be documented

3 To prevent possible leaks of questions

4 To prevent fraud, if archived If it is fraud, this is also one of the evidences.