I don't get it, they said he managed the exams to skip classes right? Also, that's 2 years after he was 5, so he should be 7. Lower Classes were from 10 to 12, Middle ones from 13 to 15, and advanced ones from 16 to 18 right? Since he skipped some, shouldn't he be in middle or advanced classes, so with people that are 8 years older at a minimum? Either I didn't get it, or the author screw something...