The Graduate Record Examination (GRE) is a standardized test used to measure the abilities of individuals who are seeking to pursue a graduate degree in the United States. GRE training refers to the process of preparing for the GRE exam.

There are several ways to prepare for the GRE, including:

1. Official GRE preparation materials: The GRE organization provides official preparation materials, including test practice books, online practice tests, and study guides.
2. Online courses: There are many online courses available that can help individuals prepare for the GRE, including courses offered by the GRE organization and other organizations. These courses typically cover all sections of the test and provide tips and strategies for improving performance.
3. Private tutoring: Hiring a private tutor who specializes in GRE preparation can be an effective way to prepare for the test. A tutor can provide personalized attention and help individuals identify and overcome their specific weaknesses.
4. Test preparation classes: Many test preparation companies and schools offer GRE preparation classes for individuals. These classes are usually taught by experienced teachers who have a thorough understanding of the test.
5. Self-study: Individuals can also prepare for the GRE on their own by using official preparation materials and studying strategies and tips.

It is important to find a preparation method that works best for you and to give yourself enough time to prepare for the test. It is also recommended to take a practice test before taking the actual GRE to gauge your strengths and weaknesses, and adjust your preparation accordingly.