Thanks for sharing your profile. Congrats on the GMAT - your academic profile is very strong (way above your target schools!) That said, I share your concern about your professional background. It sounds like your role has remained pretty much the same since you began (doesn't seem like you've been given increasing responsibility or promotions). Further, it sounds like your work is rather individualistic in nature - i.e., doesn't look like you work in and/or lead teams on a regular basis. I also share your concerns about your lack of extracurricular and community activities.
So, while it's clear that you have strong analytic capability, it is not as clear that you're a proven leader. Still, I think given your target programs and your scores, you will have a good chance.
Finally, I would pose the question of whether you really need an MBA to transition into tax/advisory services. It might be worth talking to folks who are in that field to see if an MBA is the right degree for you. Perhaps you could just take some certification courses and then apply. I don't know the answer, but worth finding out.
As for scholarships, I think it could be possible at these programs, but it's difficult to say as every program has different criteria for scholarships.
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