Final answer:
The provided text does not include information about a character named Agatha helping Sophie with spells and classes. It appears to be various excerpts from different literary works unrelated to the specific question asked.
Step-by-step explanation:
The passage does not specifically mention a character named Agatha who changes herself to help someone named Sophie learn spells and do better in classes. The provided text seems to be fragments from different literary works that do not relate to a narrative about Agatha and Sophie. This task appears to relate to a literature or reading comprehension assignment where a student is expected to analyze and discuss the themes, characters, or plot development in the given excerpts. However, as there is no direct connection to the question about Agatha and Sophie in the provided text, a factually accurate, professional, and friendly response cannot be given based on the excerpts included.