A high-achieving math student in Ca Mau, Vietnam, has had his perfect score of 10 revoked due to allegations of cheating during the national high school graduation exam. This decision was announced by Nguyen Van Nguyen, the Director of the Ca Mau Department of Education and Training, following reports on social media.

The controversy began when posts surfaced online accusing the student from Ho Thi Ky High School of using a mobile phone during the exam on June 11. Although several other students witnessed the incident, they were hesitant to report it to the exam supervisors. The following day, the student’s phone was confiscated after the school was informed.

The results of the exam were released on July 1, revealing that the student scored 10 in math, 6 in literature, and lower scores in physics and chemistry. Upon investigation, the student admitted to using his phone during the math exam. The school’s principal and vice-principal, along with other officials present during the exam, reported that there were no unusual occurrences as suggested by social media.

Academic records indicate that the student had impressive grades in math throughout his high school years, with scores of 8.5, 9.3, and 9 in grades 10, 11, and 12, respectively. He was also a member of the school’s math team competing at the provincial level.

The Ca Mau Department of Education and Training confirmed the student's perfect score in math and stated that they would report the incident to the provincial People’s Committee for further action against the student and the exam officials involved. The national high school graduation exam for 2026 is scheduled to take place on June 11-12, with the organization of the exam delegated to provincial and city authorities, including supervision and grading.

According to the exam regulations, mobile phones are prohibited during testing, and any violations by 12th-grade students result in the annulment of their exam results, effectively failing them.