The student often skips school and his teacher is worried about his progress.

skips 是动词 skip 的第三人称单数形式，skip 本意是"跳过、遗漏"，在这里引申为"故意缺席"。 school 指"学校"，在这里指"上学"这个行为。 skip school 是一个固定搭配，意思是"逃学、旷课"，指学生未经允许故意不去上学。