I did the management consulting thing in the mid 90s in the Silicon Valley. I learned a lot but was miserable working all the time just for money. I decided to move across country and get a PhD. Then, decided to get married, have kids, and teach a my hometown local university. I would never go back to that life. The only reason that I can think that they use these IQ things for interviews is because early in your career, you often have to walk into a project and learn a lot about the industry, the project, etc really fast. You don't really become focused until you have been on a few projects with overlapping characteristics, then you start getting placed on other projects with those same characteristics. They also test for your ability to sell yourself and think quickly on your feet.
