@Stat Assistant Professor It is definitely not possible to have double majors, minors, etc in the country where I am currently attending college in. However, it is possible to take sufficient math classes usually required for Statistics PhD. It is possible for me to take at max 3 semesters of calculus, 2 semesters of linear algebra, 2 semesters of real analysis, a semester of probability, a semester of programming, the 2 semesters of economics statistics already included in my major (econ stats here basically covers the same material as math stats), and 2 semesters of math for econ (optimization, etc). Nonetheless, it will probably be hard for me to take other math classes other than the above mentioned. Will taking the GRE Math Subject Test help?
Or applying for Masters at the really top programs (Stanford, Harvard, Berkeley) while applying for PhD at lower tier programs seems more possible?