If you just want to know your IQ, why not do Mensa testing? That's what I did. You can do a home test first (they mail it to you and you mail it back to be marked once you've completed it). The home test is not eligible for membership qualification, of course - you need a proctored test for that (I did both).
The home test is only as accurate as the degree to which you follow the instructions. Use a timer, and follow the exact time frame that they give you. Make sure you've had adequate sleep, proper nutrition, and prevent all interruptions (I unplugged my phone). They mail you the results to let you know if your score would have qualified you for membership, and then you can decide if you want to proceed with the proctored test.
You can skip the home test, of course - you don't have to pay to do both. Once I got my score (IQ 153) I wondered why I'd wasted my time at home and not gone directly to the supervised test.
Btw, I've never actually been to a Mensa function (I found my husband without an IQ test ;-) ...I just wanted membership status to put on my resume since I've never gone to university (long story short: anxiety, apathy and indecision got in my way).
Last edited by CCN; 06/30/12 02:13 PM.