The goal of postgraduate education is to train senior professionals. Because of this, when recruiting graduate students, many countries should specially examine the candidates' mastery of professional basic knowledge. Only candidates who are good at applying for majors can be admitted. In contrast, American graduate schools do not seem to attach importance to professional basic knowledge. The United States adopts unified examination when recruiting graduate students and even doctoral students, focusing on students' basic knowledge and training potential. For example, the Postgraduate Entrance Examination (﹙gre﹚) mainly examines students' ability to use English, mathematics and logic. Even the gmat required by business school and lsat required by law school do not involve the examination of professional basic knowledge.

It's easy for graduate students to change majors;

If it's a liberal arts major, should graduate students change to a science and engineering major? This phenomenon is very common in the United States, because graduate students don't have to major. Many people study a major when they are undergraduates, a major when they are masters, and a major when they are doctors. Not many people study the same major from undergraduate to doctoral.

The advantage of this is that students can find their real interests and specialties from the learning experiences of different majors. Many American universities believe that knowledge is generally related and different disciplines can inspire and promote each other. Rich knowledge base, interdisciplinary knowledge learning and professional research training in different disciplines are helpful to cultivate students' innovative thinking and stimulate their creative potential. Therefore, they attach great importance to the diversity of professional background when recruiting graduate students.