It is very possible to be accepted into a top business school. In one situation, we had a client from the University of Michigan who had a sub 3.0 GPA, and he was admitted into both Columbia and Chicago.
What is most important is that you create message that you want an admissions team to take away after reading your application, and then reinforce this brand message in your personal essays and letters of recommendations. Your work experience and GMAT score are important because they are also part of this message.
If you'd like more information on your specific candidacy, you can sign up for a free 30 minute phone call with the Stacy Blackman
Team at: http://stacyblackman.com/contact
Don't be discouraged about not having attended a top undergraduate university or having worked in banking.
I hope this was of help.
Conrad and the Stacy Blackman
Interested in a free 30 minute consultation with the Stacy Blackman Team? Sign up here: http://stacyblackman.com/contact
Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap