Millions of students around the world have faced the pressure of college entrance exams but South Korea's taken the agony to another level entirely.
These students are taking exams seen by many as the very key to their future careers.
The state-sponsored College Scholastic Aptitude Test is considered so critical in Seoul those running late can get a police escort.
Cell phones and any other electronic goods have to be handed in on arrival.
For many the pressure is hard to bear.
(SOUNDBITE)(Korean) HAN HYUN-JIN, STUDENT TAKING CSAT EXAM, SAYING:
"I have studied so hard. I want this exam to be over quickly and I hope that I get a good result."
For the families of this year's 650, 000 or so taking the exam it's just as nerve wracking.
Many have been saying extra prayers for loved ones in the hot seat this time around.
(SOUNDBITE)(Korean) GRANDMOTHER OF STUDENT LEE MEE-YOUNG WHO IS TAKING EXAM, SAYING:
"I've been praying every day
