"取得好成绩" 用英语可以说成 "to achieve good grades"。
"Achieve" 是英语中的动词，意思是 "取得，实现"。
"Grades" 是英语中的名词，意思是 "成绩"。
例句：
I studied hard to achieve good grades in my exams. (我努力学习取得考试好成绩。)
She always strives to achieve good grades in school. (她总是努力取得学校里的好成绩。)
He is determined to achieve good grades this semester. (他决心在这个学期取得好成绩。)