It's not impossible to improve in general, but it may be a challenge to improve by 100+ points in one month. It depends a bit on your situation, but most people would need more time. (This is true even though you're not working right now - for most people, it doesn't work to study the GMAT 6 hours a day. Most people can't retain that much new material in one day.)
First, if you took one of our courses or Guided Self-Study packages, then you're eligible for a free Post-Exam Assessment. This is a phone call with an instructor to figure out what went wrong and come up with a plan to re-take the test. If this applies to you, please send an email to
studentservices@manhattangmat.com and request the Post-Exam Assessment.
Does this score represent approximately what you were scoring on practice tests? Or is this higher or lower than what you were getting on practice tests?
If this score represents a big drop (>50 points) compared to your practice tests, then read this article:
http://www.beatthegmat.com/a/2009/10/26/my-score-dropped-figuring-out-what-went-wrongDo the analysis described in the article and let us know what you discover; we'll help you figure out what to do next (or, if you qualify for the PEA, do the analysis and tell the teacher who's assigned to do your PEA).
How have you studied so far? What materials did you use? What was your starting score? How much progress have you made so far? (Again, if you do the PEA, tell the assigned teacher all of this info.)