他学习成绩很差 英语怎么说？谢谢

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。

do poorly 就是成绩差的意思，相对的就是do well

he does poorly

还有 score poorly
bad grade

His performance (of study) is weak.

反正不能用bad，国外说差生都用weak students

He has lower test scores
He is weak/poor in study.

His grades are poor.