The most appropriate title for this paragraph is "Ang Unang Araw ng Pasukan" because the paragraph talks about Julia's excitement and preparations for her first day of school. The details mentioned, such as Julia preparing her uniform, bag, and lunch, getting up early to shower, and going to the dining room, all indicate that it is the first day of school. Therefore, "Ang Unang Araw ng Pasukan" accurately captures the main idea of the paragraph.