What about teacher Xiandezai's education in Li Shang?

My daughter sent Li Shang here to study math. The two brothers and sisters didn't go to the same place, so as not to affect their study together. More importantly, we can try counseling from different institutions. The teacher and I have the same surname, so we are related. She teaches her daughter very hard, and her math has changed from 80 to more than 90, and occasionally she can earn 100%.