Various cogs in South Korea’s national machinery paused briefly on Nov. 13 so as not to distract the nation’s high-school-age kids, as 650,000 of them were sitting for the decisive university entrance exams (which are several levels more important than SATs or ACTs for American students). Large companies and government agencies told employees to commute later in the morning — to keep traffic lighter for students traveling to the 1,257 test centers — and “no-fly” zones reduced noise during the 40-minute period when students tested aurally on the English language.