I'm interested in playing a role in determining mathematics curriculum and goals for K-12 students. I'm currently a college student. How do I even begin down this path? Math? Political Science? Education?
As somebody who has been involved in state and national standards work, I think there are a few ways in. Most important, become a mathematics teacher and gain some experience in your public schools. From here, you will have opportunities to engage in larger conversations around district and state policies and figure out who's who in that world.
Seek out opportunities to be around the people in your district who are a part of these conversations, gain experience, and eventually there will be district level positions or state positions around curriculum and instruction.
Along the way, you should complete higher degrees, specifically studying mathematics education.
There is no quick road, fortunately, and you should expect years of classroom teaching before considering a seat at the table. This is only fair.