1、You can inform your kids that bad grades won’t hurt them at all in life, if they actually learn to master valuable skills and put them on offer to the world at large.
He performs poorly in school.或:His school performance is very poor.或:He does poorly in school.避免直接用 test scores 或 examination results,因为那样反而违反了英语国家的思维习惯,让句子显得中国化。