Understanding the CISSP exam's approach to testing is just as important as the materials and concepts. In study materials I find questions that are broad or general tend to look for answers that are broad and general, rather than specific ones that focus on technology or processes. The opposite case is also true.
When I studied for the exam I found myself injecting my personal experience every so often when thinking about the questions/concepts. Sometimes it's helpful and other times it's not. A good way to approach a difficult problem is asking yourself, "What is the exam looking for?". Then if all else fails, you can revert to, "In my experience, what would I do?"
Hope this helps.
FYI: the score is NOT given to those that PASS, but it is given to those that fail, accompanied by a list of domains in order of how you scored. This enables you to focus on your weaker areas to prepare for the next attempt.
Practice tests can be a great tool are a big hinderance. If you just study the paractice questions and answers until you can get them all answered correctly you will fail the real test everytime unless the practice test is stolen from the real exam. What I used to tell my students way back when I was teaching was, when doing practice test even if you know the correct answer you should break down all of the answers and not go on to the next question until you can state why the correct answer is correct and why the wrong answers are wrong. The wrong answers are there to distract you so they are valid items. So if you know what they are along with why they are wrong then you learn four things with one question or at least show you know four things from each question. Oh and you are double checking your self not just going by what the prcatice test says is correct. I have seen some of the practice test have the wrong answers.
I am also glad you are keeping at it. A lot of people do not pass the first time. Good luck next time.