I always studied at 12 (then we had this system). So, the question was as follows, it was necessary to mark insects, the type of mosquito, carpenter, etc. Among them was a spider, but as a diligent child, I taught the paragraphs of the textbook at home and knew that the spider was not an insect, but an arthropod (or something like that, I don't remember now). Therefore, I did not mark it in the test. We get answers, and I got a point below, approached my teacher and said that the spider is not a insect. To her honor, she went to her biological teacher, corrected her assessment and told the whole class to remember that if you are sure you are right, you must insist because the teacher is not always right. Years have passed and it is still pleasant.