Does Carnegie Mellon allow you to pick which school you will be applying to in the common app? I have seen this for every other college but CMU only asks for the national math tests the applicant has taken.
If I remember correctly, CMU actually requires you to select (in order of preference) two colleges/schools in your application. For instance: Dietrich College of Humanities and Social Sciences / Statistics. You may be admitted to one, both, or neither. At least that how it worked for the CMU class of 2020. Good luck.