What is the most accurate IQ test?

Mensa USA and Mensa International offer at-home pre-screening tests at reasonable prices. If you live in the US, you can take the US test for $13. Sign up at

http://www.us.mensa.org/AM/Template.cfm?Section=Mensa_Home_Test&Template=/customsource/cfauthnet_sim/forms/mht/form_mht.cfm

If you live outside the US, there is a link at the bottom of the US Mensa page that will take you to Mensa International.

The links will also explain how to take the actual Mensa entrance exam, a full-featured IQ test that takes about three hours and must be administered at a testing site.