Membership in Mensa is open to persons who have attained a score within the upper two percent of the general population on an approved intelligence test that has been properly administered and supervised. There is no other qualification or disqualification for membership eligibility. The term "IQ score" is widely used but poorly defined. There are a large number of tests with different scales. The result on one test of 132 can be the same as a score 148 on another test. Some intelligence tests don't use IQ scores at all. Mensa has set a percentage as cutoff to avoid this confusion. Candidates for membership in Mensa must achieve a score at or above the 98th percentile (a score that is greater than or equal to 98 percent of the general population taking the test) on a standard test of intelligence.

Generally, there are two ways to prove that you qualify for Mensa: either take the Mensa test, or submit a qualifying test score from another test. There are a large number of intelligence tests that are "approved". More information on whether a test you have done is approved, as well as information on the procedure for taking the Mensa test, can be obtained from the nearest Mensa office. There are no on-line tests that can be used for admission to Mensa.

Mensa has no other eligibility requirements other than IQ testing. However, many tests are not valid for people under the age of 16. You should contact the nearest Mensa office for more information. If you've never taken an IQ test, or don't want to bother with getting official copies of your test scores, then Mensa can test you. You will be put in contact with the local testing coordinator who will tell you about specific testing dates and places.

Mensa can also send you a pre-test you can take in the privacy of your home. When you've finished it, send it back and it will be scored, and you will be notified of the results. If your score is high enough you'll be invited to take the qualifying supervised test. The pre-test is just for practice, you can't use it to qualify for Mensa even if you score at or above the 98th percentile (although the pre-test is not required for admission, many people take it simply for the challenge).
Feel free to contact Mensa of Wisconsin testing coordinator for more information or to arrange testing.