3.25 GPA from a target school, how to increase my chance?

I am currenly enrolled in Boston College Master of Science in Accounting program. I graduated in May from BC with BS in accounting and finance majors. I totally messed up my undergraduate study, graduating with a GPA of 3.25.

I heard people say that for BC Master students, if you have a > 3.0 GPA, you are locking the Big 4 position since BC is the target school and has great reputation in Boston area. But others say that the minimum GPA requirement is 3.3, which I have not reached.

I will have 150 credits when I graduate May 2016, and I am preparing for the CPA exam. I plan to pass BEC and Aduit before the end of 2015.

Any chances I can get to the BIG 4 (the recruiting process starts this week)? And what should I do to boost my chance with such a low GPA…

Thank you guys!