Generally, the answer you will hear from most admissions offices is that they just look at the 'best quant and verbal combination.' However, in this instance, I wouldn't take it again until you know for SURE that you are ready to make a big score jump. If you haven't been seeing improvement on your practice exams, why would you take it again?
Let me know if this makes sense.
Brian Lange | Manhattan GMAT Instructor | North Carolina
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