I think the Mensa tests are made artificially easy, since they want people to pay trhem money. It's quite easy for people to improve their IQ scores by practis

I think the Mensa tests are made artificially easy, since they want people to pay trhem money. It's quite easy for people to improve their IQ scores by practisingf the questions. I once took an IQ test from a book (I think it was by Eysenck) and then did another test from the same book a few days later. On the second test I scored 27 points higher, so by definition my IQ was 27 points higher; I doubt if I was any cleverer in any meaningful way. I suspect that part of the Flynn effect (that IQ scores have been increasing over time) is due to people being more familiar with those sorts of puzzles. Having said all that, I suspect that being able to learn from experience (and therefore get higher scores on similar tests) is a pretty large factor in intelligence.