I'm sorry you had a disappointing test day.
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even though my highest score was only 620, i was confident that I would score around 650 at the GMAT.
Don't assume that next time. Assume that your practice scores are in line with what you should expect on the real test. And that's only true if you took your practice tests under 100% official conditions (as much as you can). If you skipped essays, took longer breaks than allowed, etc, then your practice test scores may have been inflated.
And that's one question I have for you actually - why did your scores drop a bit on real test day? They dropped in both the quant and verbal sections. Did you skip the essays on your practice tests? Did you take longer than an 8-minute break between sections? That might have led to stamina issues on test day.
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was short on time towards the end of the section.
Okay, that also explains part of it - if you mismanaged your time, that would likely lead to a score drop. Did you have any timing issues on practice tests? Use the below article to analyze your most recent MGMAT CAT, then come back and tell us what you found out.
http://www.manhattangmat.com/blog/index ... ice-tests/(Note: don't just give us the raw data - do the analysis. Tell us what you think the data means!)
That additional data will help us to determine what you need to improve, and that will help us give you specific advice about what to do.
Next, read this article immediately and start doing what it says:
http://www.manhattangmat.com/blog/index ... anagement/Finally, do you have a specific deadline? You're looking to improve your scores by 30+ percentile points in each section. That's a VERY significant improvement - most people wouldn't be able to do that in one month. You may need more time than that.