"校级三好学生" 用英语可以说作 "outstanding student at the school level"。
"Outstanding" 意思是 "杰出的"， "student" 意思是 "学生"， "at the school level" 意思是 "校级的"。
例句：
He is an outstanding student at the school level. 他是一名校级三好学生。
She is known for her hard work and dedication, making her an outstanding student at the school level. 她以努力工作和奉献精神著称，是一名校级三好学生。
He was awarded the title of outstanding student at the school level for his academic achievements. 他因学业成就获得了校级三好学生的称号。