Prospective CRNA Student

I will be graduating with my BSN in May 2013. I did not apply myself and unfortunately will be graduating with a 3.1 gpa when i graduate. As I have been exposed to different specialties, I have finally come to the realization that I want to become a CRNA. I live in NJ and I have been looking at UMDNJ CRNA school.I already know about the requirements and know having a high gpa is good. It states on their website that having a 3.0 is the minimum although high gpa's are preferred. I just want to know what can I do after graduation to raise my grades in hopes of becoming a CRNA. Please help me. Thanks