A self-test of intelligence is something that you can do on your own to measure your own intelligence. It's like a test you can do by yourself at home or online. You can answer questions about different topics like math, science, reading, and more in order to see how much you know. After you finish taking the test, you get an overall score showing how “smart” you are. It’s a way of seeing how well you compare to other people who took the same test.