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The plot is about how middle schoolers evolve. The setting of the school shows the everyday life of the main middle schooler going through the struggles of being a preteen and the preparation for high school. (If this doesn’t help google the plot of the story and think about the setting and the the relation.)
I think words and math are important because you use words everyday and if you don't have a very good vocabulary you wont be able to talk to people. Math is also important because you need to know how to count or you wont be able to get a decent job and it also comes in handy when cooking or telling time.