I TA'd a fist year University course using, I believe, that textbook during my final two years of undergrad. The material itself is difficult to learn and hard

I TA'd a fist year University course using, I believe, that textbook during my final two years of undergrad. The material itself is difficult to learn and harder to teach well. At my University, it seemed that the Prof had to teach the subject for 3 or 4 years before they could reasonably get half the class to pass the final exam. At the same time, I've often felt like I would have no harder of a time teaching the subject to 11 year olds. It's just a weird topic.