GRE is a test that is useful when a student want to get admission a graduate course abroad in countries like USA.
If we compare it with SAT, it a test of analytical, critical, verbal and reasoning skills of a student.
What is GRE?The full form of GRE is Graduate Record Examination. The GRE exam is designed and administered by the Educational Testing Service or ETS. If you are applying to a Masters or a Ph.D. program in the U.S., GRE scores are almost mandatory. For most of the programs, they require a GRE score. Additionally, universities in other countries like Germany, UK, France have also started accepting GRE scores. https://galvanizetestprep.com/blogs/what-is-the-gre/
GRE is useful to people who want to do an MBA course.
The test is difficult compared to the SAT and it has great difficulty in terms of preparation of English (Verbal Ability)
GRE is more useful for masters and GMAT is useful for business school admissions.
There is no negative marking.