Last time I took one of those tests I was so baked and got 142 I think lol. Ever since I was a little kid I scored high in stuff like SAT test etc.

I agree that your IQ generally doens't make you a smart or dumb person, and that the higher/lower it is the more difficulty you have "connecting" with people simply because after about 30 points difference there is a large enough gap in the way people think it is hard for them to relate.

I for example possess litle to no "common sense". I don't remember birthdays, phone numbers, hell I get lost all the time minutes from my house on commonly traveled roads. At the same time I can rattle off facts that pertain to things I deem fit to remember and are generally more acedemic in nature.

The point I wanted to make it that IQ is a rating that (i think) is more about your potential to learn. In your mechanic example, you have the potential to learn to do the same work as they do but they may not have the potential to be a physicist for example.

These tests generally looks at the approach you take to problem solving, more than the solution itself.