South Korea (It's not quite about the exam takers, however. It's about a company that offers coaching -- online):
... In this country, where people’s status and income at 60 are largely determined by which college they entered at 18, South Korean parents’ all-consuming task is to ensure that their children enter an elite university. And that requires a high score on the college entrance exam.
By tapping into those anxieties, which deepen during recessions, Megastudy has become South Korea’s fastest-growing technology company, with sales expected to grow 22.5 percent this year, to 245 billion won ($195 million), even as the country’s economy is projected to contract.
About 2.8 million students, including approximately half of all college-bound high school seniors, are members of Megastudy, which allows them access to some of the country’s most celebrated exam tutors. For a fraction of what they would pay at traditional private “cram schools,” students can watch video-on-demand tutorials on home computers or download them into hand-held devices for viewing in the subway or parks. They can skip or fast-forward through some parts of a lecture and bookmark or repeat the rest.