Hi Mal,
I have a few questions about how you've been studying and your plans:
1) When you mentioned the 440 and 570 scores, were those scores that you earned on the Official GMAT or on practice CATs?
2) On those Tests, what were your Quant and Verbal Scaled Scores?
3) If those were practice CATs, then did you take the ENTIRE CAT (including the Essay and IR sections)?
4) Have you taken any other practice CATs? If so, then what were those scores (including the Quant and Verbal Scaled Scores for each)?
5) When are you planning on taking the Official GMAT?
6) When are you planning on applying to Business School?
The GMAT is a predictable, standardized Exam, so you CAN train to CRUSH it. However, you may have hit a ceiling doing things "your way", so you might have to learn some new tactics and invest in some new GMAT resources.
GMAT assassins aren't born, they're made,
Rich