It measures your basic IQ and there is a chart that shows where you are as compared to the other people who took the tests.
I suggest taking the practice test.
If you can't get all three test questions right, something is wrong, brotha/sista.
But don't be discouraged and do take the real one, which has 38 questions.
Do post your results here if you want. Comment box. :)
Mine is 132.