EDIT

To get into Columbia Business School there are a few steps that you need to take:
(a) make sure that your grades are as high as they can possibly be during your last two years of school since admissions weighs your most recent grades much heavier than your earlier grades (especially if you can adequately explain why they might have been lower for a period of time).
(b) start building a real community service/extracurricular activity platform. What you have now is not competitive but you have plenty of time to change this situation. Even better, make sure that you pursue leadership roles in these and make meaningful contributions to every organization you choose to participate with.
(c) I would pursue a summer internship at your family company; especially if you plant to some day work there and lead it. This way you could say that you have experience with the organization and can speak about its future (with authority) in your essays.
(d) start making connections with Columbia students and alumni so you can start building a base of support, especially people from the area where you plan to establish yourself post-graduation
(e) remember that not all finance jobs are equal in the eyes of admissions. Be selective in terms of organization and function that you choose.

Good Luck.

Kimberly Plaga
Senior Admissions Consultant
Manhattan Review

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