In the us and many places, you have to take tests to have a good life. Only smart or priviledged people pass them. Whats the difference between a master class and a master race
Which intelligence test do you have to pass to have a good life? I am not aware of such a test, unless you believe that, to have a good life, you must make a lot of money, which requires passing some exams. Which would be a simple-minded and sad world view.
I think newtem0's point is exactly the opposite: regardless of how hard you work or how determined you are, your maximum intelligence comes down to genetics, which is something that you can't change currently.