I'm currently a first year PhD student at a respectable but not top-ranked math program. I'm also confident that I am among the top three first year students in my program. As an undergrad I went to a somewhat prestigious liberal arts school and was valedictorian of my graduating class. I did a little bit of research and took a fair number of upper level classes (although no grad courses) along the way.
In hindsight I can see where the problems lay with my application. As the title of this post suggests, I got a mediocre score on the math GRE. In addition to this, I was kind of a late bloomer as a mathematics student. I didn't start taking many upper level courses until my junior year. The people who wrote my recommendations were not necessarily all that famous either.
So I got into all the programs that I thought I had a good chance of getting into but none of the programs that I thought would be more of a stretch. The one I'm currently attending gave me a good fellowship and I've been doing very well here so far (passing qualifying exams, taking lots of classes and doing well in them). But I honestly feel like I'm not being challenged quite enough.
Long story short, I screwed up on the GRE when I first took it and I want to try to transfer into a top-ranked program now. I've heard plenty of times that top programs will throw out applications with low math GRE scores. But does the same standard hold for grad students applying to transfer? Will programs throw out applications from current grad students if their GRE scores are too low? To be honest I do feel a bit silly thinking about retaking it. Of course, any advice on transferring between programs in general will be greatly appreciated.