You know I'm supposed to do that as well. In e.g. religon, I skimmed through the literature but it was basically useless and nothing new to me so I havent purchased it. Yet still in class, I'm the only one responding to the teacher while the others sit there like questionmarks while they have their books xD Soo that must count for something!!!
Thus, I'm sure you will do well without the book.
I feel the same way, time flies and its like the older I get the shorter the days become. I remember when the days used to be long and I used to do so much.
Change can be good sometimes, be sure to embrace it the best way you can ^^ I'm sure you will do well without the book