For sentence completion questions try to think of a word that would best complete the sentence before you look at the answer choices. If you're really stuck, try to eliminate one or even two of the answer choices, thus increasing your chances of having a correct best guess.
For analogies use the two words in a clear and specific relationship sentence in your head before you look at the answer choices. Eradicate analogy pairs that are obviously wrong.
For antonyms, be aware of secondary definitions of words, as test-makers love to use an ordinary word and test you on a slightly obscure definition.
With the reading-comprehension section, practice and figure out which method works best for you: reading the questions first and then searching for the answers in the passage, reading just the first and last paragraph and then looking at the questions, or reading the passage from start to finish and then going to the questions. You need to try different methods, so you can find out what works best for you.
Memorize any formulas that you might need for problem-solving ahead of time. Keep in mind that the first few questions in the math multiple-choice section are simple and you shouldn't spend a great deal of time on them. If a question seems too time-consuming, look for a trick or a shortcut.
For questions in the quantitative comparison section, keep in mind you don't need to solve the problem, but just make a comparison. Study the problem carefully; the answer is usually simple and does not require intricate calculations.
For each essay, make sure that you adhere to the standard essay format: an introductory paragraph, a minimum of two supporting paragraphs and a concluding paragraph. Make sure that for every opinion you offer, you have clear reasons and examples, from history, literature or current events. Watch out for repetitive words and phrases like "I think."
Make sure that you have in fact answered the essay question, instead of just talking about the subject that the essay question focuses on.
Always check for grammar, spelling and punctuation mistakes.
Wear comfortable clothes on the day of the test. Don't change your daily habits. If you normally drink coffee in the morning, continue to do so.
Don't spend too much time on one question.
Don't rush through the test.
Bring a snack.
A week before the test, drive to the test center on the day and time that you will eventually be taking the test in order to give yourself a sense of the traffic conditions.