The GRE tests your vocabulary skills using direct and indirect methods. For example, you'll need a good vocabulary to correctly answer questions in the verbal reasoning section. However, you'll also need to understand the meaning of words throughout the reading passages and in all the other sections of the test, too.
Some study guides include lists of 3,500 words or more that test takers are advised to learn before trying the GRE. While this can seem overwhelming, there are a few ways to boost your vocabulary. First, start by selecting just four to six words per day to concentrate on learning, and associate the words with pictures that make them easier to remember. In addition, if a word contains a prefix or suffix, use it to deconstruct the meaning -- a helpful tip if you're ever stuck during the actual test [source: Srivastava].