How to Join Mensa
How do I qualify?
To qualify for membership, you must have received a score in the top 2% of the general population on a standardized IQ test, once in your life. You can either present evidence of a previous qualifying score or take the Mensa proctored qualifying exam. (See below.)
What tests are accepted?
There are many different test scores that are accepted for membership to Mensa. The qualification scores change periodically. Up to date information on the tests and qualifying scores that are accepted is available from the American Mensa website on the American Mensa, Ltd.: Join Mensa - Test Scores page.
I have a qualifying Mensa score.
Congratulations! The next step is to contact the National Office.
American Mensa, Ltd.
1229 Corporate Drive West
Arlington, TX 76006-6103
800-666-3672 or 817-607-0060
At the American Mensa Information and E-mail Links page of the American Mensa website you can view an online brochure, download a printable application form or request information from American Mensa via E-mail by using online forms.
The Mensa Qualifying Exam
The supervised Mensa admission test is given regularly at several locations in the Western Michigan Area: Contact the nearest Area Coordinator for testing information.
(plagiarized from http://www.mensa-ny.org)