The problems from undergrad (I think we used Purcell) were virtually identical. Jackson's book had problems which were more algebraically/computationally difficult, but otherwise; it was basically the same thing. It's a well written classic; no reason to use the book with slightly wimpier problems.

He asked me how to learn physics; not how to learn some wimpy undergrad physics which doesn't give you the big picture. Hindsight my undergrad E&M book was a waste of time, and we should have just used Jackson. I still have Jackson (and Eyges) on my shelf; the undergrad book was recycled years ago.