The academic rankings of major universities in mathematics can refer to the world rankings of soft subjects. The top ten universities are Thackeray, France (eleven), Princeton, Sorbonne University, France (the merger of Big Four and Big Six), Stanford, Cambridge, MIT, Oxford, new york University, Federal Institute of Technology Zurich and Paris College of Arts and Sciences (a member of Paris Normal University).
Orientation of studying abroad and school choice
In view of your situation, I suggest you use the study abroad positioning system. That is: enter your GPA, major and other information into the volunteer reference system for studying abroad, and the system will automatically match the cases of classmates similar to you from the database to see which institutions and majors they have successfully applied for, so that you can see what level of institutions and majors you can apply for at your current level and accurately locate yourself.
In order to match more similar cases, my experience is that I can match more without entering language scores such as IELTS. If you are a professional, you can write vague words. For example, if you are majoring in applied mathematics, just enter "Mathematics" directly, because the course names of each school are different.