My Younger Sister Won't Wash Her Hair for 100 Days in Order to Save the Top Prize.

Before the college entrance examination, my mother didn't let us wash our hair. Belief will wash away the knowledge from your mind. I didn't believe it, but my sister did it obediently. Later, my sister was laughed at by the whole class for having a head that was dirtier than a pigsty. She cried and begged me to take her to wash her. As a result, she failed the exam. When my mother questioned me, she blamed me: "If my sister hadn't taken me to wash my hair, I would have been the top candidate!" In a rage, she pushed me into the river. When I opened my eyes again, I heard my mother's words again: "One hundred days before the college entrance examination, no one is allowed to wash their hair!"