what are the chances of rejection in converting H4 visa in F1?

what are the chances of rejection in converting H4 visa in F1. Are there any rejection chances in converting H4 in to F1. OPT is the only purpose of doing that.plz advise, some universities or colleges where low gre score is accepted.

A University must look at GRE scores holistically as so many other factors are equally important. How committed is the University pushing your visa conversion to help you? Write to me at sshankar@chu.edu, I will be happy to help