A There are even special pillows for sale that fit over the arms of the chairs to make sleeping in class more comfortable. (3rd paragraph)
B However, the biggest challenge for the government is the hagwons. (5th paragraph)
C Only the students with the best grades get a place. (2nd paragraph)
D ... and the most popular ones make millions of dollars a year from online and in-person classes. (2nd paragraph)
E The students with the worst grades do not manage to get a place in one of Seoul's top universities.