My understanding is it was an all-hands-on-deck, divide-and-conquer thing. The big brand cram schools had literally hundreds of teachers whose only jobs was pre

My understanding is it was an all-hands-on-deck, divide-and-conquer thing. The big brand cram schools had literally hundreds of teachers whose only jobs was preparing students for admission exams. They could easily have each question solved by 5 different teachers in parallel.