Hundreds of thousands of masked students in South Korea, including 35 confirmed COVID-19 patients, took the highly competitive university entrance exam Thursday despite a viral resurgence that forced authorities to toughen social distancing rules.

About 493,430 students were taking the one-day exam at about 1,380 sites across the nations, including hospitals and other medical facilities where the 35 virus patients and hundreds of other test-takers in self-quarantine sat separately from others, according to the Education Ministry.

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Students arrive to take the college entrance exam at a high school in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Hundreds of thousands of masked students in South Korea, including 35 confirmed COVID-19 patients, took the highly competitive university entrance exam Thursday despite a viral resurgence that forced authorities to toughen social distancing rules.

Parents watch their children head to the college entrance exam in front of a high school in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. The electric board reads: "Welcome to students." (AP PhotoAhn Young-joon)

Education officials said authorities banned military exercises and will temporarily stop air traffic to reduce noise during English-language listening parts of Thursday’s exams, as they did in past years. Government offices and many private companies asked their employees to come in late, and the country’s stock market delayed its opening to clear roads for test-takers.

A student hugs her mother, right, before entering a high school to take the college entrance exam in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Mothers hugged their children and patted their backs before they entered a temporary exam site set up at a high school in Seoul. One shouted, “Don’t be nervous! Do Well!” and another screamed “Cheer up!”

A student waves to her father before entering a high school to take the college entrance exam in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Park Yu-mi, an anti-virus official in Seoul, also asked companies to have at least one-third of their employees work from home.

A student  wearing a face mask prays before the start of the annual college entrance examination amid the coronavirus pandemic at an exam hall in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials are urging people to remain at home if possible and cancel gatherings as about half a million students prepare for a crucial national college exam. (Kim Hong-JiPool Photo via AP)

Associated Press journalists Kim Tong-hyung and Kim Yong Ho contributed to this report.

The annual exams are crucial for many students in the education-obsessed country, where job prospects, social standing and even who you marry can often depend on which university you graduate from.

Students arrive to take the college entrance exam at a high school in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Students arrive to take the college entrance exam at a high school in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Education officials said authorities banned military exercises and will temporarily stop air traffic to reduce noise during English-language listening parts of Thursday’s exams, as they did in past years. Government offices and many private companies asked their employees to come in late, and the country’s stock market delayed its opening to clear roads for test-takers.

This year’s exams had been originally scheduled for November but were delayed due to the virus outbreak. Experts say on-and-off online classes have widened the gap between high achievers and low performing students due to reduced interaction with teachers, digital distractions and technical difficulties.

“If the exam had been delayed again, our kids would have felt much more psychological pressure ... I think it’s fortunate the exam is taking place now,” said Kim Sun-wha, mother of a test-taker. “I hope everyone would avoid making mistakes, do their best and get good results.”

Parents watch their children head to the college entrance exam in front of a high school in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. The electric board reads: "Welcome to students." (AP PhotoAhn Young-joon)

Parents watch their children head to the college entrance exam in front of a high school in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. The electric board reads: "Welcome to students." (AP PhotoAhn Young-joon)

Mothers hugged their children and patted their backs before they entered a temporary exam site set up at a high school in Seoul. One shouted, “Don’t be nervous! Do Well!” and another screamed “Cheer up!”

Students are required to wear masks during the test, have their temperature taken and maintain distance from each other. Those with a fever will go to separate testing areas. There are a total of 1,383 sites, an increase of 198 from last year.

In recent days, South Korean officials have urged the public to stay home and avoid gatherings as much as possible to provide a safe environment for those taking the exams.

A student hugs her mother, right, before entering a high school to take the college entrance exam in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

A student hugs her mother, right, before entering a high school to take the college entrance exam in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Park Yu-mi, an anti-virus official in Seoul, also asked companies to have at least one-third of their employees work from home.

There are worries that the nationwide exams could accelerate the viral spread in South Korea.

South Korea on Thursday reported 540 new cases, taking the total to 35,703. Last week it reimposed stringent distancing guidelines in the greater Seoul area and other places to try to suppress a spike in new infections.

A student waves to her father before entering a high school to take the college entrance exam in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

A student waves to her father before entering a high school to take the college entrance exam in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials urged on Wednesday people to remain at home if possible and cancel gatherings as about half a million students prepare for the crucial national college exam. (AP PhotoAhn Young-joon)

Associated Press journalists Kim Tong-hyung and Kim Yong Ho contributed to this report.

A student  wearing a face mask prays before the start of the annual college entrance examination amid the coronavirus pandemic at an exam hall in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials are urging people to remain at home if possible and cancel gatherings as about half a million students prepare for a crucial national college exam. (Kim Hong-JiPool Photo via AP)

A student wearing a face mask prays before the start of the annual college entrance examination amid the coronavirus pandemic at an exam hall in Seoul, South Korea, Thursday, Dec. 3, 2020. South Korean officials are urging people to remain at home if possible and cancel gatherings as about half a million students prepare for a crucial national college exam. (Kim Hong-JiPool Photo via AP)