I was scoring in the 70s-low 80s on the NINJA MCQ and got an 80 on FAR (11/4/14). I just make sure to really dig into the questions you get wrong, it goes a long way.
Make a running list of items you're struggling with as you check your wrong answers that way during your down time (train commute, at your desk from work) you can listen/read the lectures on those topics you're weak at.
**I promise this isn't product placement, NINJA MCQ really does help, ESPECIALLY the sims, they really match up against what you'll see on the exam**