Chemistry 109 Curve

I am currently in Chemistry 109 at the University of Wisconsin-Madison. I have a 79% in the class overall and I have never received a C in my life. I have got good grades on all the labs, homework, and discussion worksheets, but the tests are killing me and I’m getting about average on each of the tests which is about a 64-68%. I was just wondering what a possible curve will be for chem 109?