Advanced Mathematics: An Incremental Development Book

The lower grade Saxon math books, I thought, were great math textbooks. The higher level maths books just started getting confusing. The book wouldn't explain one little part of a math problem, assuming you would figure it out or knew it. This caused a lot of stress and struggle and made math much harder than it shouldn't have been. It wasn't that I was really bad at math. I just didn't know how to fully perform problems so I got a lot of questions wrong.