english: You can also see that there is a gap of almost three and a half school years between 15-year-olds in Shanghai and 15-year-olds in Chile, and the gap grows to seven school years when you include the countries with really poor performance.
non_english: Isto tako možete da vidite da postoji razlika od gotovo tri ipo školske godine između Šangajskih i Čileanskih petnaestogodišnjaka, a razlika raste i do sedam školskih godina kada uključimo zemlje sa vrlo lošim rezultatima.