All the ways of math are so hard to memorize, its study is more about the (not) mere study than the completion of pedagogy.
That is the difference between the genius and the degree.
Study, reflect, wrestle, struggle.
That is the very definition of genius, not an A on every course.
Moreover, although it would seem that one could complete the pedagogy, it is never complete unless the whole is memorized and one is capable of using any part of it at the drop of a hat.
I don't even know if I've met someone like this, although some professors on YouTube seem to exemplify this.