Final answer:
The excerpt from Barrio Boy is about Ernesto's experience in a new school and how he changes over time.
Step-by-step explanation:
The excerpt from Barrio Boy is about Ernesto's experience in a new school. At the beginning of the excerpt, Ernesto feels different from the other students because he is not familiar with their customs and language. However, as the excerpt progresses, Ernesto starts to adapt and learn from his classmates, which shows a change in his character.