Teacher Qin left them homework and asked the four of them to help each other in private.
That meant they paired up, and while one worked on problems, the other would time them, in order to track the improvement in their problem-solving speed.
With less than a month away from the rematch, they now spend their self-study time every evening in this classroom drilling through problems.
Xie Ying'an and Qingran were a team, Li Qingmo moved to the rear desk to form a group with Fang Jin.
"This time it took 5 minutes and 13 seconds." Xie Ying'an pressed the pause button on the timer in his hand and reported a number to Qingran.
Qingran put down the pen and shook her sore wrist; she had been doing homework for several hours straight today.
The problem Xie Ying'an just did seemed to take 3 minutes and 29 seconds, tsk, nearly a two-minute gap made Qingran feel like her hand had no right to be sore.
