Warning: my answer isn't going to frustrate you. As high a score as you can possibly get. At the end of the day, schools report their GMAT scores and their rankings are based upon them.
You don't, however, need to hit a specific score to mitigate anything in your profile so that's great. You have a good GPA in a challenging major so it isn't something where if you get a 680 it's going to raise concerns or anything of the sort. Does that make sense?
Unfortunately, this is a game of numbers so try for a score that starts with a "7". When are you planning to take the test?
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