Should I send low GRE mathematics score to universities? My GRE score is only 790 (77 percentile). I am an international student applying for PhD in applied mathematics at Tier 1 schools in the U.S. I am from the top university in my country and have a strong academic record and good recommendations. I have communicated with some faculty at some of these universities and they have expressed interest in my profile. 

I am worried that my application would get filtered out just because of the GRE score. So I was wondering if I should send this score at all?
Many US universities are going to ask for the GRE results.  You probably won't be able to avoid having to send them.  Also, many schools pull the GRE data from ETS the testing service that administers the GRE.  That means even if you take the GRE a second time all of your GRE exams will likely be received by the university.  That is not meant to discourage you.  The program's admissions committee has final say on the matter and they look at other factors too.  If you are not good at exams, but good at applied work highlight that in your review process.  Good luck!!!