I'm in academia, but not in Business. I advise people regularly who are in similar circumstances with regard to the GRE. Do you believe you'll have time to study enough to improve your score? Are you reasonably confident you can do better? Again, I'm not in Business at all, and I'm sure the worlds are different in important ways, but in general I would advise people to do everything they can to make it hard for admissions committees to turn them down. There's so much in the application process that you can't control, but you can control your standardized test score to at least some degree.