680 (43Q, 40V)

I think the most important thing is to be able to convince adcoms that you can handle the Quant part of MBA. So, if you have good grades in any math subjects you have taken earlier, that will help. If they are not, it may be a good idea to give the test again(if you have not already given several times), especially because it's possible to increase your quant scores by practicing hard. Unless everything else is stellar,it's better to get your best possible score in GMAT. Others may say your score is good enough. But I think unless you feel that yourself, all the talk doesn't help. I would guess you will write better essays if you have one less to worry.