The Great Gatsby, he was great for that

I'd like to know the meaning of the phrase "he was great for that" in the following excerpt from the last chapter of The Great Gatsby:

"Jimmy was bound to get ahead. He always had some resolves like this or something. Do you notice what he's got about improving his mind? He was always great for that. He told me I et like a hog once and I beat him for it."

Does it mean that "he took a great interest in that"?

Thank you.