High IQ societies are composed of members who have scored highly enough on official intelligence tests to gain membership. Most often, membership is attained by passing one of many accepted intelligence tests (Stanford-Binet, Weschler, Cattell Culture-Fair) with a score somewhere within the 98th percentile, or better. Most official intelligence tests can be made easier with practice and a little bit of guidance. Practice tests, with documentation tailored to fit your needs, will help make an official intelligence test go much more smoothly, and with much less stress, since you'll already be used to the nature of the test and questions involved.
Most of the questions on high IQ society admission tests tend to be multiple choice. They also generally involve some form of pattern matching or other logical deduction. Official intelligence tests are something that require you to think outside of the box when attempting most questions, and there are some that you have to be able to work out with pencil and paper by knowing math and other important subjects.
Most of the distance problems are measured in meters, so if you plan on figuring out the right answer, you need to know the metric system. One type of question that you might see involves two people who leave a location at the same time. One person walks in one direction for three meters, and the other person walks the opposite way, turning after five meters and then turning again. You need to find the distance between the two people.
Another often encountered question involves age. You need to figure out how old someone is based on the age of a sibling and how old they were ten years ago. Analysis questions are big on the test, similar to those that you would find on the SAT. It is not uncommon to see a simple question like: "pear is to apple as potato is to what?"
While taking the test, you will see questions about what one person likes. Peter will like Susan and not Shawna, William but not Charles. You need to figure out the logic in the names to determine who he will like out of two names that are given. There are pictures to look at in puzzles, and you will see words that have a common word at the beginning to create new words.
Most reputable high IQ societies strive to make all questions and topics culturally fair, which means you're not going to see any questions pertaining to politics, religion, or specific institutions that might exists in some countries but not others. Culturally neutral tests have been the most difficult for the intelligence testing community to design, but are also the most important achievements for the scientists involved, because they create accurate and bias-free results.