Struggling big time retaining all the information for CISSP. Any tips or advice?

Last weekend I finished reading the Sybex book (it was brutal to get through), but I feel like I retained absolutely NOTHING from reading it.
When I did the end of chapter review questions I did perfectly fine on all but a few chapters, but now as I'm doing their online practice questions I'm seeing things that I have absolutely no recollection of reading.
I'm currently watching the Cybrary videos, and I'm listening to Phil Martin Simple CISSP whenever I can. Even with these, I'm struggling to remember anything I've seen or heard.
I'm constantly doing terrible on the Boson questions and the Sybex questions now. I'll read the explanations and just can't compute what I'm reading or even remember or retain it.
I'm desperately looking for advice or some tips on this. This week has been horrible for studying and I'm on the verge of just throwing in the towel and saying I'll just stick with my CompTIA certifications. I really want to get the CISSP certification because it has been my goal since I first started studying for security certifications, but now I'm filled with doubt about my actual ability to do this exam.
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I actually found the material more interesting to study after the break to. There just comes a point for my anyway that it's just overload and I have to step back for a bit and come back and usually when I do I understand the material better and it just clicks for me after that. Anyway that's what I have done in the past and it may suck taking a break but sometimes it's just needed.
Working on - RHCE
Also, don't quit. These higher level certs aren't supposed to be easy, it's what makes them highly sought after. Just persevere, you'll thank yourself when it's done. I remember when I first started studying for MCSA, I felt completely lost, every second word was terminology I'd never heard. My head was spinning every day of studying. Literally painful.. but I just kept trying to force the information into my head and eventually it went in. You can do the exam, just persevere.. It might just take you longer than you initially expected.
What you've got to remember when you see people saying they studied for and took these exams in X amount of time.. These people will have had a head start. Many of them will understand half the book before they've even started.
Working on - RHCE
Master of Science in Information Security and Assurance - Western Governors University
Bachelor of Science in Network Administration - Western Governors University
Associate of Applied Science x4 - Heald College
I think I will take a break over the holidays and come back to it. I had set myself a goal of taking the test by Summer, but at this point, I'm not sure.
Master of Science in Information Security and Assurance - Western Governors University
Bachelor of Science in Network Administration - Western Governors University
Associate of Applied Science x4 - Heald College
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It was a long, tedious process but I was able to pass it on the first try. don't fret too much though, it can be intimidating but well worth it. I ended up studying for almost a year because I kept thinking I wasn't ready and scaring myself out of it 2 or 3 times but I think I was good at the 6 month mark. give it a try. the worst that could happen is you fail and know for sure this isn't for you and you stick with your compTIA certs. good luck!