Paxton wants a school supply kit as he starts middle school because it will help him stay organized and ready for the challenges of a more demanding academic environment. Middle school often involves multiple subjects and teachers, and having a comprehensive supply kit ensures he has all the necessary tools, from pens and notebooks to highlighters and folders, to keep track of his assignments and class notes. The supply kit also provides him with a sense of preparedness and confidence, allowing him to focus more on learning and less on scrambling for supplies. Additionally, a well-equipped supply kit can help him make a positive impression on his new teachers and classmates, setting the stage for a successful and enjoyable middle school experience.