Not only that but standard tests don't even reach reach the point where you can distinguish people near the top. If you have, for example, Raven's Advanced Prog

Not only that but standard tests don't even reach reach the point where you can distinguish people near the top. If you have, for example, Raven's Advanced Progressive Matrices, you're dealing only with 48 questions. I vaguely remember that making four mistakes at the age of 17 means an IQ somewhere in the mid-150s (with a standard deviation of 15). If you can only distinguish three more values above 150s, I don't think you can reasonably reach even 200, not to mention 230.