Test Preparation Links-GRE,GMAT,TOEFL

Whats the key to success in GRE, GMAT, TOEFL?. Its the practice. The more you practice the more you can master the test and score higher. So I have collected a lsit of good practice sites that may be useful to you. I personally used these practice exercises while taking test. I got a pretty good score of 1400. So I would like to share it here.
Rather than devoting most of your time cramming vocabulary I suggest you to practice these tests.

http://number2.com/

http://mygretutor.com/

http://www.eduers.com/

http://www.majortests.com/gre/

http://amby.com/GRE/

http://www.greguide.com/gre-practice-tests.html

http://www.testprepreview.com/gre_practice.htm

http://library.west.asu.edu/refguides/grad-school/gre-samples.html

http://freegre.net/

http://www.grestudyforum.blogspot.com/

Please feel free to suggest more links as it would be helpful for those who are appearing for the tests.