I came across an article about Einstein getting a stellar score of 269 in an IQ test.Now that was one hell of a brain!,I think to myself.However,the article went on to state that such a score is impossible,and Einstein's IQ was actually somewhere around 180.I checked out some reliable sources I know on the net,and found that any score above 140 qualifies you as a genius.
But that depends on the test you take.I took some IQ tests on a few sites that claimed to be "the standard and very precise test for determining your IQ".I got around 140 in most ones(and ergo I have a doubt that they may not be standard after all!) There's one at www.iqtest.dk that follows the same pattern as Mensa's.I suggest you check it out.
Peace :)