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.

> Whats the difference between a master class and a master race

In the US and many places, with hard work and determination you can change your class. You can't however change your race.

That's the difference.

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.

Maximum intelligence yes. But you don't need maximum intelligence to improve your station in life.