看这个门槛标准，能有这个的也是牛蛙啊LOL

It is not required but preferable that the applicant meets one of these criteria:

- USAMO or USAJMO qualifier; 
- grade A for a college-level proof-based math course (online courses included); 
- participation in Canada/USA MathCamp, HCSSiM, PROMYS, Ross Program, or SUMaC with a letter of recommendation from a counselor; 
- a letter of recommendation from a college professor of mathematics.