There are many contents to improve the soft power of studying abroad, such as what projects you have participated in, what papers you have published, or some internship experience.

For senior high school students, one of the more popular background enhancement projects is AMC, which is the American Mathematics Competition, which is of great help in American application.

Because mathematics is the strong point of China students, it is advantageous for China students to participate in this activity, and they will get the official "entry certificate" when they participate in AMC.

More background enhancement projects are available for reference:

American Mathematics Competitions

Popular background enhancement projects