It's been called the world's best school system. For the second time in a row, students in China's richest city, Shanghai, have come in at number one in the OECD’s Program for International Student Assessment (PISA). But in the rest of China, where millions sweat through on the world's most competitive college entrance exams, the education system is still criticized for placing too much emphasis on memorization and not independent thinking. This month On China is in Shanghai. Kristie Lu Stout meets PISA Head Andreas Schleicher, Deputy Principal of Tsinghua University High School Jiang Xueqin, and Teach for China founder Andrea Pasinetti. Together they explore China's classrooms - from the country's affluent cities to its impoverished rural regions - and question whether China can replicate Shanghai's education success across the nation.