Children's story

There once was a little girl who wanted to be class president. She was the best in her class. But a class bully ran for president, too. And he got help from another class, which shot paper planes into the class room, saying the little girl cheated on her pop quizzes. The bully vowed to punish nerds, too. In the end, he won and there was sorrow in the class. How did this happen? How could it be? An investigation proved a bad little boy in another class directed an evil plot.