Freeskierboy

I am currently in my 4/4.5 years as an undergrad. I was attempting to double major in Rhetoric and Statistics. I would love to one day get a MS/MA in Applied Statistics. However, I cannot seem to do well in my Mathematics and Statistics finals because I suffer from extreme test anxiety. I feel competent and that I have the ability to take courses at a higher level, yet I currently have not been able to materialize my sentiments. I feel unable to do well at my current undergraduate program and am most likely going to "bail out" and just get the Rhetoric degree. My goal would be to one day attend a Top 10 Statistics program or a Top 25 University in Mathematical Sciences. I don't think I could get into any Masters programs with my current undergraduate GPA (3.6 Rhetoric, 2.8 stats, 2.4 cum<---story worthy of novel or 60 Minutes). I have taken practice GRE's and predict my score to be above a 750 in each, would that be enough (for some reason I do well on standardized tests only), or would I have to get another undergraduate degree? And is getting another undergraduate degree even possible?