You have never explained how the studies were "debunked." Denouncing and silencing, which is the way you think ideas and facts you dislike should be handled, is not the same as disproving.Uh, guy, you can try to pretend you are an intellectual by repeating debunked studies to make you feel better about your inadequacies, but at the end of the day, you are a sad little man.
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IQ tests have established a solid record for over a century of accurately predicting academic and economic success. This does not mean that everyone who tests high is successful. It does mean that anyone who tests low will be unsuccessful. No method has been found to significantly and permanently raise the IQ of a seven year old child who performs poorly on an IQ test.
Currently efforts are underway to enable a DNA test to measure IQ.