I scored 15 but mensa tests normally have a time limit. That test doesn't have one and it relies on general knowledge. The site itself acknowledges (albeit making it sound like it's a small thing) cultural bias in the test. For example there's at least 3 questions touching on the Bible and a few questions from English nursery rhymes. Hmmm. I would say that scoring only shows that you probably know more general stuffs rather than showing you're a genius. =)
well... i agree that official mensa tests have a time limit and are based on graphical and mathematical questions mostly... i guess that wasn't much of an official mensa test as it was a rather interesting brain teaser test on linguistics and general knowledge...