Nowadays, in Europe, more and more universities, such as those in Germany and Sweden, take GRE as one of the admission criteria for English-taught courses.
GRE is sponsored by educational testing service (ETS). 1937 was first jointly organized by Harvard, Yale, Columbia and Princeton University. Initially undertaken by Carnegie Foundation, 1948 was handed over to the newly established education examination center ETS. Since then, it has been held in many parts of the world every year. China Foreign Examination Coordination Office is responsible for the centralized management and undertaking of foreign examinations such as GRE in China.
GRE is an examination result required by graduate schools of American and Canadian universities (except management schools and law schools), and it is also the most important criterion for professors to award scholarships to applicants.
Some famous American universities regard GRE scores as "recommended scores": I hope that applicants can provide this score, regardless of whether their undergraduate majors are the same as their own graduate majors, but this is not a necessary condition. At this time, if you can provide special GRE scores, it is very beneficial to apply for scholarships.
Therefore, if the applicant has enough time, he might as well take a special exam. An excellent GRE score can reflect the applicant's professional quality and learning potential. GRE unified examination is a necessary examination for applying for postgraduate entrance examination. For graduate students applying for law or business, LSAT or GMAT is used to replace the GRE general exam.
Now American universities don't have as high a demand for the sense of substitution of grades as before. Many schools can provide any scores of GRE or GMAT as the scores that business graduate students should provide, and law graduate students also use GRE scores instead of LSAT scores.