I think it's important to isolate your weaknesses.
It appears that your quantatitive skills are solid so you just have to brush it up before you take the exam again(if you decide to do so).
It looks like you are having some problems in verbal. In what section do you have problems? CR? SC? RC? Personally for me, I had problems with just the SC --- probably stems from the fact that I'm not a native speaker but no need to elaborate on my life story.

Once you isolate the weaknesses, try the OG. Go through front and back and try to introspect on the problems you answered incorrectly before looking at the explanation. Make another educated choice and see if you are right or not. More productive time you spend on problems, more knowledge you will retain.
Most importantly, don't be frustrated!