It's not always intelligence. Someone can be smart but lazy.
I was bored and while smart, seldom got great grades. Dh was smart. HORRIBLE in school and then turned into a top in his field professional after deciding to go to university.
I've know dummies who worked hard and got great grades.
I knew a dummy who was superior in people skills. She was promoted every chance she tried.
Ignore the boasters. My dc are in college. Some of the "gifted" dc are sitting home doing nothing. Some are dropouts who are doing drugs.
Some "average" dc are doing outstandingly. Like jaw dropping amazing.
My own dd was injured in a car accident and she is struggling in university bc of brain injury.
My ds went from uni bad grades to great but decided to start a business instead of finishing degree. He's working 14 hour days doing that.
Now that i am out of the school system, i see how ridiculous and time wasting the competition is for our dc; children grow up into adults. Nobody lives well or succeeds in life bc they were best speller at age 8.
Think about all the threads about sex? That will be your dc some day. Terrible thought!!! But they do grow up.
INTO ADULTS. THEY WILL BE YOU SOME DAY.
Try to keep them on track but MOST importantly, teach them common sense and self respect so when they fly away. They wont be too hurt.
(And. No, i don't stick my nose into my dc personal life. God no! I absolutely dont want to know. However, no matter how hard a mother tries to give privacy, personal things accidentally float to the top. All i can say is that we probably didn't really get away with stuff so much as we were kindly ignored by our parents.)