Well it depends a bit on what other things you have, but given Haas' GMAT average, I'd say a 670 would be an absolute minimum (and a 710 would be nice)
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I really wish you lots of luck on your exam. And don't rush things! If you do them right, you may be pleasantly surprised at the end of this long voyage.

I really wish you lots of luck on your exam. And don't rush things! If you do them right, you may be pleasantly surprised at the end of this long voyage.