Work hard. I was not good at math in high school before, and once I took a single digit exam. In fact, I was quite desperate at that time. I feel that I am not smart enough or something. But one day I listened carefully, and the teacher reviewed his derivative for the second time. Then I finally understood something, and then I suddenly had confidence. I became interested in mathematics. Although I have an average IQ, I often brush questions. I just found a feeling. Then the grades went up. I am in my fifties at the same time. I got more than 100 when I was a second model. I feel like no one around me believes me. But I know this is the result of my efforts. I also passed the college entrance examination, although it is not high. But I think this is also an improvement. In a word, interest is very important. Is interest a teacher of life?