I have already memorized 3500 word list from the GRE book. Now I need more word. Is there any list online that has 3000 or more words that is exclusive to that of the GRE word list. If not, does someone has any source where I can found 6000 - 7000 word list.

Did you search using "GRE" and "vocabulary" as keywords?

If you do that, you'll find many lists ... for instance, this one: http://www.postech.ac.kr/~gla/gre/33new.txt is claimed to have more than 4800 words.
Hi GB,

Here's a list of lists, I hope you find what you need.Emotion: smile

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Thank you for the lists but non of them were appropriate. I think I must visit my book store. They must have an ensemble with them.
 Tanit's reply was promoted to an answer.