It turns out that the biographer made a mistake about the level of the school at that time. At that time, Einstein went to primary school in Arau, Switzerland, and the school adopted a six-level scoring system. One point is the highest and six points is the lowest. Einstein scored one point in mathematics over the years, which is the highest level. But when Einstein 16 years old, the scoring method was changed to the highest six points and the lowest one. Therefore, biographers regard the highest level as the lowest level when looking up Einstein's early school achievements. Therefore, Einstein's "childhood dullness" has been handed down.