GMAT Reading Comprehension Tests
GMAT Sentence Correction Tests
GMAT Critical Reasoning Tests
GMAT Quant Tests
GMAT Official Guide Tests
Validity of GMAT scores
GMAT score is valid for five years, so you have the flexibility of saving it—choosing to start your graduate studies right after university or later on. Remember, if at first you are not successful, you can take the GMAT exam again. Remember, though, that all of your GMAT scores from the past 5 years will appear on your Official Score Report.
http://www.coolavenues.com/forums/showthread.php?t=6181
http://www.mba.com/mba/takethegmat
http://bulletin.studylink.com/showthread.php?t=1434
http://mitsloan.mit.edu/mba/faq/index.php
http://www.gmac.com/gmac/SchoolServices/VSS/VSS.htm
http://www.ask.com/q/How-long-is-my-GMAT-score-valid
http://businessmajors.about.com/od/gmatinfo/
http://www.gmat.hu/faq.html