I don't I saw any exam date posted. When thinking about the best and most efficient strategy, we should consider our timeframe and time commitment (ie. someone studying 5 hours a day for a month vs 2-3 hours a day for two months).
In general, I do believe the OG questions are perfect because like you mention they build on each another. I've tried several things and from what I've seen the only thing helping me on my practice exams have been the OG ones. Hope this helps a little. When are you taking your exam?
_________________
Stats by August 2014
28, Asian-American, Born and raised in lower-income Bronx, NY.
2.64 (downward trend) Economics degree from UT-Austin in Dec. 2009
GMAT Goal: 710+, exam scheduled for July 27, 2013 at 12PM CST
WE: Sales Team Manager at Apple - business development and strategies for the Apple Online Store
Past WE: Financial Services advising at Northwestern Mutual Financial, Equities Trading at Kershner Trading Group
EC: 3 years of National Council on Fraternity (VP, President), Current Chairman of Texas Exes, Asian Alumni Network (2012-2013)
Target: (1) NYU, (2) Duke, (3) Michigan, (4) Texas, (5) UCLA, (6) Rice
Giving this 110%. I appreciate all advice and encouragement. Thank you, everyone.