Her school-leaving exam scores were excellent, earning her a scholarship.

school-leaving 是由 school（学校）和 leaving（离开）组成的复合形容词，leaving 是动词 leave 的现在分词形式。 school-leaving 字面意思是"离开学校的"，用来修饰 exam 表示"毕业考试"，特指中学阶段的毕业考试。