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Grade 8 is the last year of Junior High School or sometimes known as middle school and Grades 9 - 12 are High School.
翻译:八年级是middle school/Junior High School的最後一年。九至十二年级是high school -
从SSAT的官方网站解释是:The SSAT is a multiple-choice test that consists of verbal, quantitative (math), and reading comprehension sections. The Middle Level SSAT is for students currently in grades 5-7; the Upper Level SSAT is for students currently in grades 8 and above. The Middle and Upper Level SSATs share the same format and timing, and both provide admission officers with an idea of your academic ability and "fit" in their schools. http://www.ssat.org/test/test-levels-middleupper
翻译过来是:Middle是5-7年级,Upper是8年级以上。两个的考试格式和时间都是一样的。http://www.ssat.org/test/test-levels-middleupper