I took the GMAT in a Pearson Test Center in Taiwan yesterday in rush because I was overconfident after scoring 650 on GMATPrep before even studying.
But after a month of cramming OG, Princeton Review 2013, and Kaplan 2014, I came out with a 570 (Q42, V23), a lot lower than what I had expected.
The biggest problem that I've noticed is that the actual GMAT questions were nothing like the practice materials, especially the verbal section.
Biggest offender is probably the SC; tactics from kaplan and princeton review (matching subjects/objects/verbs, parallelism, etc) didn't seem to make as much sense as they did on their books.
Also, the reading passages were all one long excerpts instead of paragraphs of text. It wasn't as bad as the SC, but considering my horrible verbal score... I definitely screwed up left and right without even knowing what went wrong.
In short, I did well on official practice exams, but was awfully unprepared on the actual test. This is what I get for looking in the wrong direction.
Due to time constraints, I'll have to take the test again in 30 days.
I think this time I'll ditch OG and look more into the trickier questions from Kaplan.
I'll be back.