Zhang Yu didn't realize Zhang Xin had such grand ambitions; she just went to work every day as a social bird slaving away for retirement.
After getting home at night, she continued to research various materials and kept venturing in the stock market.
During the summer break, Wang Yun mentioned to Zhang Yu that she wanted to skip a grade, hoping to graduate from senior high school as a sophomore.
Though Zhang Yu was somewhat surprised by Wang Yun's thought, the young girl had experience with skipping grades in primary school but later decided to abandon that approach when she felt it undermined her foundational knowledge.
So now, why was she planning to graduate as a sophomore? Thinking it over, nearly all the high school curriculum would have been covered by the end of sophomore year, with senior year being a comprehensive review.