Write out a study plan. This is very important when considering a big test like the GRE, for which you should spend at least a few months preparing. Decide which key lessons you will focus on from a week-to-week basis.
Purchase or borrow a GRE study guide. These books include sample questions and tests that are formatted exactly as the actual test will be. By practicing with these books, you can become comfortable with the format of the test before you take it.
Make a few new vocabulary flash cards every day to learn and memorize. Write the word you want to learn on one side and its definition on the other. Go over the cards until you know the definition of each word without looking at the other side. The GRE study guide you use should list words that are commonly found on the exam; it is best to create your flash cards using these lists.
Brush up on your basic high-school math skills. The quantitative section of the GRE tests your mathematical skills at a high-school level, since not everyone is required to take math in college or university.
Practice writing an analytical essay using the prompts that should be included in your GRE study books. On test day, you will have to write two different essays: an analytical argumentative essay and an analytical opinion essay. Learn how to gather your thoughts and brainstorm ideas quickly but thoroughly.
Take a few practice tests. Some should be included in your study books. Make sure to time yourself when taking a practice test, since the actual exam will be timed and you will want to make sure that you answer questions in a time-efficient manner.