It was.
Tried to do it again in college, but using the LoC headings, but ran out of time and graduated before running out of college/headings.
To this day, when going to the library, I try to keep this in mind when looking over the new books, and if there is one on a major/notable subject I can't recall having read a book on, grab it.
This actually sounds really fun. Not so much in an optimized way, but more like just going to the library and picking a decimal heading and then just selecting a cool-looking book in that heading and reading it, then repeat.