Firstly, IQ only tests knowledge, spatial reasoning and logical reasoning, and most people agree that's only a tiny fraction of intelligence. Second, I very much doubt most tests have an average of 100, and so they don't really measure IQ since that's one of its definitions.
Most importantly, a true IQ test arranges its scores on a bell curve, and because of the decreasing sample sizes the further you get from the average, scores outside the 85-115 range become increasingly unreliable, and for most tests scores outside of the 70-130 range are absolute garbage nonsense. And that's for the official tests. If you got a score of over 130 on an online test, that means less than nothing.