Once you have decided that you would like to take the GRE test, the best thing for you to do first is to sign up for the exam. Make sure that you give yourself plenty of time to study but you will also want to make sure that it is not cutting it close to the application deadline for your school. It is important to do your research ahead of time so that you don't have problems later.
After you have signed up for the test, you should look into purchasing some kind of study guide that will help you. Kaplan makes a great study guide for the GRE that includes vocabulary words, math formulas, and practice tests. If you don't purchase the book right away and use it, it will be very difficult score well on the GRE test.
The next thing you will want to do is to in order to score well on the GRE test is to take a practice test right away. It is important to see how well you would do on the test without any studying. By taking a practice test, you are able to see what categories you excel at and what subjects you still need work.
Now that you have identified what areas of the GRE test you need work in, you can target those areas and start studying. Remember, you shouldn't completely ignore the areas that you scored well in. It would still be a good idea to review all areas just to refresh yourself on the things that you already know.
Now that you can begin studying specific areas, it is important to develop some studying techniques. For the vocabulary section of the GRE test, a good way to go about studying is to make flash cards. There are plenty of vocabulary lists available for your use and you should take advantage of those resources. Make yourself flash cards of words that you don't know. Flash cards can definitely help you score well on the GRE test.
Once you make all necessary flash cards, make sure you review them quite frequently. Repeating these flash cards will be the key to your success on the vocabulary portion of the GRE test.
After you make enough flash cards for the vocabulary section, it is just as important to make flash cards of math formulas for the math portion of the GRE test. It is highly likely that you have seen all of these formulas before (hopefully not too long ago)so you will need to review most of the formulas. By making flash cards and reviewing them, you should be able to remember most of the formulas and use them in the correct way.
Now that all of your review materials are in hand (Kaplan book, sample test vocabulary flash cards, math flash cards, it is essential to keep reviewing and testing yourself with this material. You should read up on how the test is formatted and how questions are phrased. The more comfortable you are going into the test, the better you will score on the GRE test.