Debrief - from 420 to 670

I hope this post helps others out there. My scores: 1st GMAT Prep: 420 (after 3 months of studying) 1st Official GMAT exam: 580 (July 2013) 2nd Official GMAT exam: Cancelled my scores (October 2013) 3rd Official GMAT exam: 620 (December 2013) 4th Official GMAT exam: 670 (January 2014) Studying Mater...