It's been more than a month since Zhou Meimei and her cousin were tutored. We gave up the rest time in the afternoon and noon. We gave them formulas and ideas of explaining problems in mathematics, physics and chemistry. They also tried hard to listen to them in class. Of course, that's what they said. I don't know.

But when Zhou Meimei said that her grades had improved by more than 110 points, I was shocked to know that what they said was true. But think about it carefully, it's reasonable that they can improve so much this time, because their last exam was so bad, with a total score...