These extracurricular "miscellaneous books" would certainly have been put away by these aristocratic families on the eve of the Spring Imperial Civil Service Examination.
Indeed, there had never been such a precedent before, where questions even extended beyond the "Four Books" and "Five Classics," catching the offspring of aristocratic families off guard. And Su Ke had been crafty, having just happened to hear about it from his fourth sister before the Autumn Imperial Civil Service Examination, which led him to review them. Otherwise, he would have been unable to answer as well.
His words greatly satisfied Lei Yin.
Strictly speaking, Su Ke had only been taught by several tutors in rotation at the academy and had not undergone systematic training like those from the big families and clans.
It was only after the Autumn Imperial Civil Service Examination that he saw Su Ke's talent and reluctantly adopted the title of mentor.
