For top schools, it's not going to be the quant that makes or breaks you.
You're an accountant. Adcoms know you can run numbers, they know you're probably detail oriented, analytical and diligent given your profession.
What isn't as obvious is your team and leadership skills. For example, schools like HBS really want a history of leadership experience (and/or blue chip background: Ivy/equivalent alma mater working in banking/consulting or other similar kinds of jobs that Ivy types get coming out of school), and if you don't have that, your chances are going to be slim. Other schools such as Wharton, Kellogg, Booth, Yale, etc. will also want that as well (but perhaps not to the same degree) - nonetheless, it will still come down to showing that you have a history of leading and working in high performing teams.
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