IQ is such a meaningless number on the internet. Everyone pulls it out of thin air, sometimes attributing it to a website that scored them and then tried to sell them some certificates. Now, to debunk the rest of your post. First of all, the author of the blog already mentioned that no deduction was given for wrong answers; he never contended that tests cannot be fair, so we don't really need you to remind us how the SAT and many other tests are graded. Second, the topic isn't about intelligence, but simple knowledge on a given subject. On a very difficult test, for example, knowing more could even hurt you, because some wrong answers are made to "seem right," in an effort to increase the test's difficulty. I actually do agree with the blog that a test that is too difficult isn't always the best way to test individual knowledge; however, he does overestimate the probability of dumb luck.