I was tested at 7, 11 and somewhere in my 20s (schools did the first 2 and I did the last to see what the fuss was about) I scored about 170 on all of them.
School number one thought it was cute and encouraged me to play with the other kids - good idea as I am socially inept!
School 2 used it to get me an interview at a posh prep school: I was offered a plce and funding, but dad couldn't afford the hats let alone the rest of the uniform - or mum decided that as DSis was unlikely to be offered it wouldn't be fair. Knowing my parents they loved the idea, indeed they still boast about it now, but couldn't be arsed to get me on the early bus!
The one I did for myself was because I was always referred to as the 'less intelligent' one. No idea why... so I took it and scored 174... went to a single local MENSA meeting and never went back!
For me that was all the encouragment I needed to start planning on going to university. We knew DH was at least as 'smart' as I am and he got lucky and went first. He too had been held back by family perceptions of him as lazy and stupid.
So what is all that about? Sorry
I now know more about the IQ test and it is quite severley flawed, even with recent updates it still carries social and racial bias. I was lucky the question about servants and when they should knock on doors had been removed years before I took it, but my Nana remembered it - and thought it was daft (apparently everybody knew that a housemaid never knocks as that would simply be announcing her presence - and who needs to know a housemaid is present?).
But, when it matters (as it did when some super snooty twat was interviewing me rudely) I can smirk and think "Hey, I am an official genius - you can fuck right off" 