Go into any Church of Scientology Org. They have one that gives a pretty good indication of your intelligence. It is a timed test. If I remember correctly there are 75 questions and you only get 20 minutes to complete it. I could be wrong on the time allowed. It was the last I.Q test I would ever subject myself to, simply because of the stress it put me under. 140 was my score.
Just go in for the test and nothing else.