Schools do not look negatively at candidates that take the GMAT multiple times. Three times should be fine and if anything, they will view your recent score of a 710 in a positive light given the first two scores. Congrats on pulling that score up! If you're overly concerned about the 75% on the quantitative section, you can also substantiate your quantitative skills by detailing the work that you've done as a CPA and the grades that you earned in quanititave courses during undergrad.
Regarding whether or not you are competitive at your target schools...I would need to know more about your leadership/accomplishments and your extra-curricular activities or personal achievements. Can you share more details?
Monica Okrah
MBA Mission
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