Internet Intelligence Tests are a fruitless endeavour. Intelligence is subjective, and relative to the individual. Also, there are many forms of intelligence, such as Creative, or Kinetic. Is a Rocket Scientist necessarily more intelligent than, say, a Farmer? Both have to have extensive knowledge of their respective fields (the latter in the literal sense...) in order to be considered successful.
True intelligence is the sum of all knowledge; Pin Numbers, Birthdays, memories of specific times and events, names of friends and relatives, where you left your car keys, etc. As such, intelligence is really impossible to calculate. It is better to have faith in yourself then rely on a test for your confidence.
Perhaps that is just sour grapes, though... (grumble).