Does IQ matter?

In this article, the writer questions if IQ matters. They weigh the marginal benefit if you try to pay attention and improve your IQ, then it is worth going to school. If a person is just going to school to make it look good and they are not learining anything from it, then is their money going to waste? IQ does matter according to the article, if you pay attention in your classes and interpret what you know than your IQ is improving. If you just study and take a test just to take it then you are not improving your IQ only memory, so is it really benefitting you? What do you think?