intelligence tests are designed to test purely intelligence not knowledge however they don't example: my mom when she was a kid took the IQ test there was a question that asked if canine is dog than feline is?. my mom answered the question correctly cat but she answered it correctly because she knew a ton about cats. In the question you were supposed to make a logical connection between cats and dogs but what if someone had grown up without cats and dogs being put together or like my mom knew a ton about cats. the question is inaccurate because its supposed to test intelligence not knowledge it is virtually impossible to have a perfect intelligence test because all questions require a certain amount of knowledge and lack of knowledge to be answered correctly