grade school 和grade schools 的区别

grade school 和grade schools 的区别 degree 和 grade 的区别 grade和level的区别 grade junior的区别 grade grades的区别 grade school Junior和Grade有什么区别吗?我是高二的,用Junior还是Grade 问下transcript 和Report cards,grade reports的区别 out of grade school through grade schools and up into junior high school 中的 grad mark和grade有什么区别? score和grade有什么区别?