Years ago, a student told me of method he used to study for certification exams. This blog entry talks about it. In short, you can read study material into an MP3 recorder. Whenever you have the chance, you listen to the recordings. Since MP3s are so portable you can listen to the recording just about anywhere.
As a twist, someone recently told me they had their girlfriend record the material. He liked hearing her voice more than his own. Think about your girlfriend or boyfriend saying in their most sultry voice "Integrity is used to verify that data has not been modified." It sounds like a great idea.
I guess the only danger is that when someone starts talking to you about security issues you may remember the voice and get a little excited. But is that such a bad thing?
Good luck with your studies.
CompTIA Security+: Get Certified Get Ahead: SY0-201 Study Guide