GMAT Strategy

Manhattan GMAT CATs assign difficulties by overall GMAT Scores (500-600, 600-700). My understanding is that overall score is a derived score determined by Verbal & Quantitative Score (Verbal 27, Quant 47 --> GMAT Score = 610). If that's the correct understanding, should not the difficulties be assigned by Verbal or Quant Scores - something like 20-25,25-30 etc to arrive at the individual Verbal/Quant score?

Please advise.

I wouldn't worry too much about how MGMAT presents the scores - all you really need to know is the score range of the questions that you are getting right and wrong so you have a better understanding of your strengths and weaknesses. Why spend your time trying to elevate the algorithm when you can spend it working to improve your score right?