Right, but that was just an example of the types of questions on most IQ tests. The one I was given at a psychiatrist's office had no words or even letters for

Right, but that was just an example of the types of questions on most IQ tests. The one I was given at a psychiatrist's office had no words or even letters for the multiple choice answers. As far as dropping your students near Lake Chad, that's not general intelligence. Babies born in Chad learn how to navigate their area, just as your students can. The question would be who would be able to learn how to do it faster, and how many of each group could learn more complex things.