<p>It’s pretty unreasonable to say that IQ tests are completely useless because they might be a little flawed. I mean, what isn’t? There are other ways of demonstrating intelligence besides IQ tests for those who may not do well on IQ tests for other reasons. Good IQ tests even try to ascertain the extent to which external factors contribute to variations in performance, and are probably designed in such a way as to minimize such factors.</p>