You can apply for a Mensa home test and pay a small fee to get it marked. That's what I did. They say you need to take their full test to get a more accurate figure, but I still got an estimated IQ of 155.
Here is a workout test: http://www.mensa.org/workout2.php
It's by no means an accurate IQ test, but if you get a score of "excellent" then you could probably pass the Mensa tests and have an IQ in the top 2% of the population.
Here is a workout test: http://www.mensa.org/workout2.php
It's by no means an accurate IQ test, but if you get a score of "excellent" then you could probably pass the Mensa tests and have an IQ in the top 2% of the population.