I agree. The vast majority of online iq tests are unreliable as they were not constructed by psychologists and probably do not correlate well with real iq tests.
And even real iq tests cannot fully test all of our abilities and unique talents.
To illustrate this point, consider this real life story.
Richard Feynman, Nobel winner in physics, one day went to his old high school and looked through his records. To his surprise, the results of an IQ test he took in high school showed that he had an IQ of only 125, which is not much more than the typical college graduate.
His reaction? "To win a Nobel Prize is no big deal, but to win it with an IQ of 125, now that's something."
Had he known his IQ was only 125, he may have never had the confidence to pursue studies in physics and accomlish all that he had.
The lesson I learned from this story: wronghole too could POTENTIALLY win a nobel prize in physics if he applies himself.