These are 500 of the most common difficult words used on past SAT and GRE tests.There are 50 lists of 10 words each where you must match a word with its definition.Vocabulary is best learned over a period of time.Don’t try to do them all at once. Pace yourself.Do a few lists a day or a few at a time.You should write down words that you miss and make your own list on index cards for review.Remember that you don’t need to know all the words in a question to answer it, just enough to make a reasonable guess or eliminate choices.Good luck!