What DID help me was "learning how to learn" - which was kind of what I thought was the biggest thing I got out of my undergraduate work. I went in to college unable to pick up a book and really "know" it, to being able to do exactly that. And that is what has gotten me through every job since then, the PE studying, and even a few things in regular old life (thank God for those "what to expect when you're expecting" books)
I was hoping to be able to draw from my work experience for much of the PE exam, but unfortunately the exam doesn't cover most of what I do (stormwater, septic systems, and state regulation writing). So I had to learn from the ENVRM, and when that wasn't enough, $1,400 of new textbooks. Being able to read a new chapter, step back from it and see/understand the underlying concepts behind the subject is the biggest thing I got out of school, and I think that is crucial to learning or studying anything.............
And if I learn that I have failed the exam, I will return and delete every word I have just written!