MBA admissions focus much more heavily on your entire application than those for a Masters of Accountancy. So, your work experience will be a huge portion of your application and interview. Given a 600 and a 3.0, your chances will be made tough. According to a quick search, their site shows a class profile middle 80% GMAT range of 660-750 and GPA of 3.2-3.9. Being below both of those metrics puts you in the bottom ~10% of applicants by both measures. Chances are, a poor GMAT/GPA can be compensated by a strong GMAT/GPA and strong experience, letters of recommendation, and interview.
I hope this doesn't scare you, but it seems that this may need to be one of your “reach” schools, rather than your first choice. Are you set on getting an MBA, or is UCLA some dream that you have? Also, FYI, (https://www.gmatcat.com/Percentiles.html), a 660 GMAT is in the 84th percentile while a 600 is around 68th. Every 10 points here matters so study your heart out and do your very best here. You can't change your GPA. So, bust your bum to ace the GMAT, and then focus on finding good recommendations as well as practicing for interviews and such. Best of luck. Don't see admission to UCLA as a reasonable expectation, but it's not impossible. On the other hand, I'm sure you could manage to get into some decent MBA program with enough prep and strong application.
FAR - 87 (1/12)
AUD - 86 (2/12)
BEC - xx (5/12)
REG - xx (7/12)
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