In mid-September, Mr. Yun told Sisi about the reintroduction of the Gaokao. At that time, the news was not yet public, presumably classified internally. However, given Mr. Yun's status, it was perfectly normal for him to know in advance; it would have been abnormal if he hadn't known.
Mr. Yun was aware of Sisi's desire to attend university, and that's why he informed her early, hoping to give her more time to review. He wondered if this girl could make it. Even if she didn't, he could help Sisi get into a university, but Mr. Yun Po Bi had always disdained academic fraud. He admired most those genuinely knowledgeable and capable.
Alas, if that girl really couldn't pass, he, the old gentleman, might have to break his rule for once. It wouldn't hurt for a girl to be less scholarly; she wasn't expected to become an academic! (Tian Xinhua cries: Sir, you favor females over males.)