Why Does Scout Look Forward to Starting School?

According to SparkNotes, Scout looks forward to starting school because she hated being alone while her older brother Jem was at school and because she wanted to be playing and learning along with the other children.

In Harper Lee's classic novel, "To Kill A Mockingbird," Jean Louise Finch (Scout) and her brother Jeremy Finch (Jem) do everything together during the summer, but Scout feels isolated when Jem attends school in the fall. When it's finally her turn to begin school, she eagerly looks forward to it. Scout, who serves as the narrator of the novel, states in Chapter 2 that she "never looked forward more to anything" in her life.