Yin Yue, a mother with a 15-year-old daughter, feels like after-school academic tutoring is everywhere again in Guangzhou, the city where she lives in southern China.Five years ago, China launched a sweeping crackdown that drove much of the industry out of sight. But prep centres had quietly begun popping up again in popular commercial areas across the city, said Yin, a pharmaceutical sales manager in her 40s.In Guangzhou’s shopping malls, these centres are now among the busiest tenants,...