Can you believe that my daughter didn't pass math since she was a child, and she just started junior high school math, ranking first in her class?

There is no need to doubt and deny her achievements in a hurry. Junior high school mathematics and primary school are completely two concepts. Those math problems in primary school mathematics are just developing thinking, which has little influence on junior high school mathematics. Maybe your daughter suddenly understood and found a way to learn, so it was easy to catch up. Now you can think that your daughter's grades have really improved, encourage her, give her rewards or something, and then observe the next exam. Even if this achievement is wet, my daughter will study hard because of your encouragement and high expectations. Of course, if you really find that the grade is adulterated, deal with it strictly.