Adult skill retention vs. PISA score

South Korea has enjoyed a commanding lead in PISA (國際學生評估測驗) in the last few years. However, according to a recent 2014 report, their skill retention is pretty short-lived. Reason: "many university graduates training for white-collar jobs that don't exist"     source:  http://thelearningcurve.pearson.com/reports/the-learning-curve-report-2014