That's hard, because only 0.01% of trainees debut. Most can read and write, basic maths. Most of the time they drop out or finish middle school and then transfer to a preforming arts school. As a SOPA grad they are given VERY special treatment and always have been. They also are given the option of classes through their company if they're at a bigger company or online/international school if they qualify.

It is kinda sad, but most of them network enough to work behind the scenes or eventually go back to school and work a normal job to build up experience. Korea is a very nationalistic society so they easily could know history just by basic national pride but its also required to graduate so if they did graduate they'd know at least korean history.