I failed the first time I took the exam too. But I was too much into a techie mindset, I had to see things from a management mindset in order to pass...
Please don't lose heart. Just because you didn't pass the exam doesnt mean you lack knowledge. You just didn't meet the specific criteria of the exam on this occassion.
I would suggest to study thoroughly but don't draw it out for too long. The exam content is huge and when I was studying, I realised that after a few months I was already starting to forget material. Try to segregate the domains and take notes as you go along. Try to choose a few ISC2 recommended resources and stick to them rather than expanding to lots of resources as I think this might help you focus better.
I would also suggest that you try to enjoy the process of studying. Some of the material may not seem relevant but you are gaining new knowledge in this vital sector.
I studied very hard but during the course of my exam, I didn't think I would pass. With your continued dedication, I'm sure you will pass in due course.
I scrolled through all of the responses and I didn't see anyone recommending the review courses. I too an INTENSE 1 week review class (after studying on my own for a couple of months). I took it online, but the teacher was EXCELLENT at including both the online and in-person students in the conversations, so I almost felt like I was there. My classmates really supported each other. I took the exam the day after the course was done and passed on my first try.
The course REALLY helped me to focus on what was most likely to be covered on the exam and not get too tied up studythings that very rarely appear on the test.
Keep at it! I'm sure you are learning a lot just doing all of that studying.
Prashanth, I am sorry to hear that you did not pass. That is a big chunk to swallow when the exam is quite expensive. I personally believe that carefully reading the questions and trying to think about them from a Manager's standpoint may help you. I would ask myself how would somebody in management answer this question. Also, pay attention to how the question is worded because sometimes a single word can cause the answer to the question to be different than you would think.
To be honest with you, you need two books, depending on your/ one's experience: I highly recommend the 7th Edition Sybex CISSP Text - (Your Number 2, as noted in your list.)
I also recommend ... wait for it ... "Dummies Guide - CISSP (Blue key edition). Yes, I know, "dummies" version, but it is an excellent refresher, and I believe, the first one to be approved/ endorsed by (ISC)2, but do not quote me on that.
Finally, nothing can replace experience!
I hope this helps!