Re: Mensa...
From what I remember, Mensa membership criterion is being in the top 2%, and was around the 140 mark when I was a member a decade or three ago. I don't think the UK or worldwide IQ range has slipped so low that 132 represents top 2% now.
I think you do a trial test at home and if you score 132 or higher then you can apply for the formal test for joining - and that has the threshold of around 140.