Vietnamese students won six medals including one gold at the International Mathematical Olympiad 2016 in Hong Kong.
Vu Xuan Trung, a 12th grader from the northern province of Thai Binh, won the gold, which is his second after the one in Thailand last year.
Trung’s score ranked 23rd out of 602 contestants from 109 countries and territories.
The other five students from Binh Dinh, Hanoi, Ho Chi Minh City, Nam Dinh and Thanh Hoa won four silvers and a bronze.
Their total scores put the Vietnamese team at number 11, compared to the fifth position last year and 10th in 2014.
Teachers guiding the team said some students underperformed as they were nervous.
The US team came first by winning six golds, followed by Singapore with four golds.
The 57th edition of the contest was held between July 6 and 16. Contestants sat through the tests for nine hours on two days.