Maybe in the early 1900s, but not today.
> As many note, the ability to do well on these tests is greatly increased by practice, as with most testing procedures. The notion that an IQ test is a standalone measure of innate intelligence is not well supported.
Then everyone would score 200+.
> If we go to 'higher level' mental processes, such as pattern recognition, symbolic interpretation, analytical capabilities (i.e. higher maths), and creative capabilities (inventiveness), again we see that these abilities are highly trainable.
Yes. Nutrition, education, etc can help you reach your potential. But there seems to be a natural limit. Not only that, some have a natural talent for it and people have different levels of potential.
If you believe what you believe, then why haven't you used your revolutionary knowledge to increase the IQs of people with downs syndrome. All it takes is training right?