First of all, keep a calm mind. In fact, it is normal to receive a rejection letter in the application. What you have to do is actually to find out why you were rejected. Is it because the grades are not enough or the materials are not complete enough? Or for other reasons, if you want to know the specific reason, you can send an email to the school's admissions teacher to ask, and the school will usually answer.
Secondly, if you feel that your grades and so on have reached the standard of applying for the exam, but don't know why the school won't believe you, you can also submit a complaint letter to the school. I need to make it clear in my letter that I hope to get another chance. What do you want is a chance for the school to re-evaluate or a chance for students to re-explain their own strength, both of which need to be clearly stated in the letter.
Third, it is often easier to receive a reply by sending an email to the office in charge of enrollment in the school. If the school has answered the specific reason, and this reason has a great chance to make up, then you can ask whether the school can retake the exam now. If the school says no problem, it means that you still hope to be admitted, so hurry up and take the exam again if your grades are not enough.
But no matter how you communicate with the school, the tone or words in the letter need to be handled properly. And because some schools may not accept students' letters of complaint or reply, students need to know the relevant policies of this school. If you send a letter of complaint but never receive a reply from the school, then you don't have to send it again and again.
Fourth, you can also ask whether the school can change majors and let the admissions staff re-examine. But it is also possible that this major will not be accepted. However, if the school does not recommend a major to students, it means that it is more likely to be admitted if you switch to this major. Or if you can accept a branch school, you can ask the school if you can send the offer to the branch school. Many universities in the United States have branches, and the admission standards of these branches are often not as high as those of the main campus, so there is still hope for admission. If this school is a guaranteed school and there is no other good choice except this school, it is a good idea to go to its branch school.