answers: age 18 or 19
context: at age 18 or 19. High school students are commonly expected to study increasingly long hours each year moving toward graduation, to become competitive and be able to enter attractive universities in Korea that almost all parents and teachers want students to enter. Many high school students wake and leave home in the morning at 5am. When the school is over at 4 pm, they go to a studying room in the school or to a library to study instead of going home. This is called 'Yaja', which literally means 'evening self-study'. They don't need to go home to eat </s> more stress on their children's "hagwon" studies than their public school studies. Additionally, many students attend academies for things such as martial arts or music. The result of all this is that many middle school students, like their high school counterparts, return from a day of schooling well after sunset. The average South Korean family spends 20% percent of its income on after-hours cram schools, more spending per capita on private tutoring than any other country. High schools in South Korea teach students for three years, from first grade (age 15–17) to third grade (age 17–19), and students commonly graduate </s> from grade to grade regardless of knowledge or academic achievement, the result being that classes often have students of vastly differing abilities learning the same subject material together. In the final year of middle school examination scores become very important for the top students hoping to gain entrance into the top high schools, and for those in the middle hoping to get into an academic rather than a technical or vocational high school. Otherwise, examinations and marks only matter insofar as living up to a self-enforced concept of position in the school ranking system. There are some standardized examinations for
question: when do you graduate high school in korea