That's a pretty interesting background. I don't know many people with law backgrounds who go to b-school. Definitely use that to your advantage.
Someone like you, with a law background (stereotype: good communicator) and an accounting background (stereotype: good with numbers) should be able to get into a top school. Your background is already fairly well-rounded, so the GMAT isn't the most important thing for you. I think you can show that you're a smart enough applicant. But ideally you'll be able to top 650. My guess is that you're clearly "smart" enough... It's more a matter of getting comfortable with the test. If you can't top 650, you can still get in, although it will be a challenge. If you're below your target school's middle-80% range, then it will be very hard.
Also, what do you want to do with an MBA? Continue in your current line of work? A compelling, focused application story can often overcome a lower GMAT score.
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