Please sign up. Do you really believe that your perception of your abilities is more accurate than that of objective tests? And if you believe that you aren't that intelligent, then why do you trust your reasoning and not that of the researchers who designed the study? Do you think they've made some great error in selecting these criteria? Do you think you are smarter than them? ;) Either way, you definitely should sign up.

Oh, and you don't have to be in the 99,9th percentile. The 99,865th percentile totally suffices! ;)