Hey simsim45,
I do not have experience inside the actual program, however, I was just accepted into their Ph.D. program in communication. I would be happy to help on any specific questions you have on the application process.
As for the GRE, I know USF leans heavily to the qualitative side of communication so I doubt that your math scores will be too important. Obviously, you don’t want to do poorly so I suggest you at least brush up and try to have an average score but they will probably be more interested in other things.
Can I ask you what your specific interests are? I know USF is very strong in ethnography and autoethnography for methods but it is also a balanced program. A huge thing to look for is fit with instructors and the program. I would advise looking at the faculty page and researching to see if and who fits your interests.
Hope this helps!