Are you currently a sophomore? That, plus being a grade risk, can definitely work against you.
I found a nifty calculator online that will help you figure out how many credits of "A" you would need to pull your cumulative GPA up to a 3.0. According to the calculator, you'd need 22 units of A to improve a 2.3 to a 3.0.
http://www.back2college.com/raisegpa.htm