I wish my teachers hadn't done that. They blew my "I can't understand" excuse for not doing homework right out the window.
I’m not yet 50, but fortunately was educated before social promotion - by educated teachers who would fail and hold back students who hadn’t mastered certain objectives by year-end.
Sadly, those days are gone; the only requirement for high school diploma is attendance...
I wish my teachers hadn't done that. They blew my "I can't understand" excuse for not doing homework right out the window.
About the worst thing you can do for a genius kid is tell them they're a genius. Removes all incentive for them to work hard or try to understand a concept they don't natively grasp. I've made a very deliberate effort as I homeschool my daughter to never tell her "You're so smart", but instead emphasize that she worked hard to get the right answer.
My mom used to let me think that scoring 99% percentile on standardized tests meant I'd missed a few answers and could do better.