I'm a non-US citizen applying for PhD programs in pure mathematics in the US. I'm mainly aiming for top schools, e.g. Harvard, MIT, Yale, Princeton, Stanford, UCLA.
I have taken the GRE mathematics subject test and scored 880 (91st percentile). In many universities the GRE subject score is optional, so I am wondering if I should submit it. I believe this is a good score, but I want to verify it because I don't know how it compares with other applicants to top schools. If it is relevant, my undergraduate studies grades are very high.