In to kill a mockingbird why is Scout so excited about starting school in a week?

Her day was bad because Miss Caroline was mad at Scout for learning, already knowing how to read and write.
Scout's first day of school wasn't that great. She got in trouble many times for already knowing how to read and telling the teacher about the cunnginhams. Scout explained that the Cunnighams don't borrow anything they knew they can repay. and she ends up getting her hands hit with a ruler