[sph]

IQ is not concentration. In fact, IQ or intelligence in general does not have a single accepted definition†. You are not "stupider" because you have no patience to sit down to concentrate to do a silly test. Nor you are "smarter" because you found it so engaging you hyperfocused and did it in one sitting.

IQ tests are designed by people that want to create automatons easy to quantify and categorize.

† My definition of intelligence is "ability to solve novel problems." With this definition, an uncontacted tribesperson can be as intelligent as a Nobel prize winner. The difference is education, and the type of problems they're facing, which is just a matter of context.