work experience and your GPA is not sufficient information. With that said, I don't think you should be going into this process without a 650+ GMAT for those schools.
If your GMAT is not within the median of the 80% range for a school then you really should be applying to that school honestly. This requirement is necessary but not sufficient.
The average for Iowa is like 670 and the minimum average for 80% starts at 610. But the person with the 610 GMAT is bringing a great deal to the class in many other ways.
Know that if the average is 670, if you are come from an over-represented group, it needs to be higher than that.
I would not try to apply that school without meeting that minimum, especially given that your work experiences half of what they have as an average.
Look at the profiles for each of the schools and if you match that then great, but if you don't there's probably no logical reason to think youre the exception and not the rule.
Think about how you have worked at the GMAT number so far and mix it up. Try something else. Get a tutor, join a study group, do a different program, get help. DELEGATE. don't just "try harder" by yourself.
The effort that you invest in that score is going to yield high dividends in terms of the school you get into.
Be as determined with this as you would be starting a business because in many ways you are.
Farrell Dyan Hehn, MBA
Admissions Consultant & Verbal Strategist MBAPrepCoach.com