- This extensively updated manual offers comprehensive preparation for the Graduate Management Admission Test, beginning with an overview and introduction to the test. The GMAT is a computer-adaptive test, the details of which are described in the book"s introduction. Following is a diagnostic test with answers and an extensive Correct Your Weaknesses section, which presents separate chapters on essay writing, reading comprehension, sentence correction, critical reasoning, and math. Three full-length practice tests are presented with answers, analyses, and directions to help test takers evaluate their score.