I can't. According to the official regulations of USA Tournament, the deadline for submission of USA Tournament is: February 9th morning 10. The official requirement is that the deadline for the competition is 9: 00 a.m. After 9: 00, you can't revise the test paper, even if you find mistakes. Meisai, the full name of American Mathematical Modeling Competition for College Students, is a mathematical modeling competition for college students (MCM/ICM competition for short) organized by the American Federation of Mathematics and Applications.