Open Book

I have two exams this semester, and both are at least partly open book. Since I'm about to graduate and have a pretty casual attitude toward my grades, this open book business is a nuisance to me. For a closed-book exam, I would probably just read through my notes a few times and take my chances. With an open-book exam, expectations will be higher; now I feel like I have to spend time organizing my notes, writing cheat-sheets, putting tabs on things, and what-have-you. After the thousands of hours I've sunk into my legal education, these last few dozen feel like too much to ask.