It's a Bildungsroman as it focuses on Pip's journey from childhood to adulthood. We witness his moral and psychological growth, his encounters with various people and events that shape his character and worldview.
Great Expectations can be classified as a Bildungsroman mainly because it shows Pip's transformation. He starts as an innocent child and undergoes many challenges and revelations that mold him into a more mature and self-aware individual.
Great Expectations is a Bildungsroman because it follows the growth and development of the main character, Pip. We see him learn from his experiences and mistakes, and change over time.