You need to be familiar as possible with the different aspects of the test. You will need a strong, college-level vocabulary.
Most Frequently Tested Words
These words you'll need to study! Make Flashcards, and do drills. To make them easier to memorize, dissect the words (prefix, root, suffix)
Word Parts
Even knowing the words most commonly tested, there's a good chance you'll come across other words. By knowing common prefixes, roots, and suffixes you can dissect the word to find its meaning.