They're not worthless but I guess it depends on what you're rmtrying to measure. Treating the result as a measure of innate ability that can't change is wrong I think.
A lot of it is a function of ho...
People who tolerate being trained in abstract reasoning are the people with high IQ... No amount of training is going to make dumb people understand abstract thinking. People have different intellectual capacities. That's just the ugly reality.
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