学习成绩好用英语怎么说

good academic performance

或看一个朗文字典里的例句,自己参详一下
He's a popular child, but not very academic.
他是个讨人喜欢的孩子，但学习成绩不太好。

学习成绩好
You grade is pretty good.

be good at study,或do well in study.

the schoolgrade is good

do good job in study

good in study