If we flip the question around it seems more reasonable: would your IQ test score be accurate if you did not train beforehand on practice IQ tests? I would pre

If we flip the question around it seems more reasonable: would your IQ test score be accurate if you did not train beforehand on practice IQ tests? I would presume not - most tests are timed, and if you are spending time on first-time only tasks in understanding the problem then the result is inaccurate. If you train out those first-time tasks so that you are repeatably using the time budget in the test to solve problems then you should reach some kind of steady state and produce repeatable and more accurate test scores. My take is that the repeatable scores measuring your steady state in the task would be more accurate than the untrained scores with an unknown amount of initialization time within each problem. I would make a similar claim to naasking below that this could account for some of the Flynn effect.