Twin studies lets you fix the genetics factor, but unless you monitor the twins 24/7 or control their environment it is nearly impossible to tell if it influenc

Twin studies lets you fix the genetics factor, but unless you monitor the twins 24/7 or control their environment it is nearly impossible to tell if it influences your intelligence directly or through behavioural patterns. I am sure that if you train specifically for the g-factor test you would score much higher on it. And if that is the case it is your environment influencing your intelligence.