Hi Luke,
When I was studying for the exam, when I reviewed my wrong responses, i not only reviewed the right answer, I categorized WHY I got it wrong. count up the number of wrong answers for each category and start where you make the most mistakes.
For me, In some cases, it was merely a fact I didn't know. Fine. Now I know, move on. In others, a certain process was an area of weakness, so I would re-read that topic in the Rita book. My biggest gain was the realization that often got a question wrong because I was going too fast and wasn't reading carefully. I forced myself to slow down and, eventually, I approached questions more carefully.
I do encourage you to keep trying, and to bring your scores up to 80%.... The accumulated wisdom of other PMP aspirants' attempts shows your likelihood of passing is much higher one you reach 80% or above.
I hope this helps!