mpmpmp3

hey guys! I was wondering if you could give me some insight about how to best use my next few years as an undergrad. i go to a top school in the US, and i'm double majoring in math/econ. I have an OK GPA, but i've already worked as a research assistant for two professors and hope to do my own research next year (i'm a rising junior). is it best to use the next two years to take upper-level math and graduate-level econ classes, or to focus on raising my gpa? i've already taken real analysis, linear algebra, probability theory, and two semesters of calculus, so i don't need much more math.