Hi aepmk,
Many Test Takers become too fixated on the 'implied level' of the questions that they're working on - instead of what really matters: defining WHY they're getting questions wrong and becoming more efficient at approaching the overall Exam. Instead of thinking in terms of 'mastering' concepts at a perceived score level, you might find it more effective to think in terms of whether questions are 'gettable' or too difficult. To maximize your performance, you can't afford to miss the gettable questions.
Based on your post history, you've clearly been studying for the GMAT for some time. Before I can offer you any additional advice for your studies at this point, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) Have you taken the Official GMAT? If you have, then how did you score?
2) How long have you studied in total?
3) What study materials have you used over the course of all of your studies?
4) Over the last 3 months, how have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
5) What is your goal score?
6) When are you planning to take the GMAT?
7) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich