That test wrote:
You checked 19 items out of 54.
This score is in the average range of intelligent adults.
What I find more telling, however, is what I did after taking the test. I noticed a little link going to the same test, only in my native language. That was a pleasant surprise. I then proceeded to compare the two, and I noticed some of the questions were a bit different.
Question 7 contains the word 'terugkerend' in the Dutch version. In the English version, it's 'repetitive'. Those two words are similar, but not exactly interchangeable. 'Repetitive', to me, indicates something happens very often in an almost-indentical way, while 'terugkerend' refers to something that keeps happening, but not necessarily in a specific way. 'Terugkerend' means there is a structural but very general problem; 'repetitive' could mean something more specific is repeated.
Question 8 contains the words 'zeer specifieke onderwerpen' in the Dutch version. In the English version, these words are summarised by the word 'arcane'. That seems to indicate it's something understood by just a few people. As with the previous question, it's an overspecified version of the original text. 'Zeer specifieke onderwerpen' simply means 'very specific subjects', and doesn't necessarily refer to something very obscure. Something 'very specific' could be SS Edmund Fitzgerald instead of just 'sunken ships'. Arcane knowledge would imply that it's something very few people know anything about. For example, the first three days of research after the discovery of the wreck of SS Edmund Fitzgerald.