The following "six types of candidates" must be tested for nucleic acid within 7 days before the exam, that is, candidates who have lived abroad in high school or high-risk epidemic areas, returned from overseas, had contact with foreigners or have suspected symptoms, candidates who have been isolated or have been isolated and have not been tested for nucleic acid within 14 days before the exam, and candidates with the same family members. Candidates who have worked before the exam (internship) 14 days belong to medical personnel in medical institutions, workers in centralized isolation points, service personnel in public places, port quarantine personnel, public transport drivers, railway and aviation crew members, frontline workers of imported cold chain food, candidates with abnormal body temperature 14 days before the exam, and candidates with "eight-point health code" in the orange code. When the above candidates enter the test center, they should bring the negative report (certificate) of nucleic acid detection within 7 days before the test to the test center for verification. Candidates who fail to show it are not allowed to enter the test center for interview.