IQ measures how well you will do in life after all...

A person with high IQ will more likely have much better habits and hobbies like reading more books, better work ethic, and even better executive functioning because them being able to engage comes much more natural for them, this is probably one of the reason why they get such good grades easily in school because doing tasks that requires heavy levels of abstract thinking feels easy for them.

As a low IQ, I never was able to get better habits to save my god damn life like reading books, chess, etc. because my damn brain cannot really cooperate most of the times with these hobbies as I cannot really stay focused most of the times.