People/children can have a PG IQ and perform poorly in school and others can have an average or only above average IQ and perform extremely well.
To me, so much of "success" in life is what you make of whatever talents you have. There is no short-cut for hard work. Being organized, working hard, and being a friendly person will get you very, very far in this world. Having a high IQ with nothing else won't get you very far.