What is the GRE exam d?

The GRE exam, or Graduate Record Examinations, is a standardized test that is widely accepted by graduate schools in the United States and other countries as part of the admissions process. There isn't a "GRE exam d." There are several GRE tests, but they are usually referred to by their full names or abbreviated forms, like:

* GRE General Test: This is the most common GRE test and assesses verbal reasoning, quantitative reasoning, and analytical writing.

* GRE Subject Tests: These tests are specific to particular fields of study (e.g., Biology, Chemistry, Physics) and are required by some graduate programs. These are less common than the General Test.

Therefore, "GRE exam d" isn't a recognized term. You likely need to clarify which specific GRE test you are referring to.