There are different IQ tests that are available. Some of them can be taken whenever you try to get into the school of your choice. At times, you have to answer the IQ test when you want to become an employee of a company. What if you are just curious? There are still different IQ tests that you can find online.
Some of these are reliable and there are also some that are only made for fun. You can always research the different IQ tests available. Some of them would need to be purchased while others would allow you to answer when you are online.
The Wechsler Scales have been the most widely used in the western world overtaking the much older Binet-Simon and others. The Wechsler have been normed on huge samples and if we take "intelligence" in your question to mean measured intelligence, then the reliabilty of the Wechsler is extremely good. Various aspects of intellectual functioning are measured, and these sub-tests are divided into verbal and non-verbal main scales.
In this way, high functioning individuals who perform better with objects and spatial tasks can be identified, rather than solely those who do well on working memory, vocabulary and verbal reasoning tests. The IQ is determined by averaging scaled scores resulting from each of the sub-tests, that is, taking account of all the tests. A Performance IQ is derived as well as a Verbal IQ, and the IQ normally given to describe an individual averages these two separate IQ areas.