*Antonyms: (http://www.majortests.com/gre/antonyms.php)
*Analogies (http://www.west.net/~stewart/gre/qr_analo.htm#A1)
*Kaplan sample test (https://www.kaptest.com/login.jhtml?cid=157640)
*Official ETS site providing all the details http://www.ets.org/Media/Tests/GRE/pdf/gre_0809_practice_book.pdf
I have received this suggestion from a survey that GRE BIBLE is really helpful and prepare you well for the difficult level questions and also people have received similar type of questions from GRE Bible.
*** Also, You may refer -http://www.dictionary.com/ where you will find the meaning of a certain word and also to the left side you will find the synonyms. This is the fastest way to learn many words at the same time.
*** I encourage you to leave comments. It may include your doubts, any other related query, doubts related to verbal or quant problems, any suggestion, etc.
*** MORE LINKS COMING UP ***
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=> Well I request all those who are preparing for GRE, to share with us the links that you follow. Those links can be related to tests, vocabulary, quant, etc.
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