This study aims to analyse what standards secondary school students in different academic achievement levels (AAL) achieve in Korean and to find out the hierarchy of the difficulty of the standards among students. Based on the result of NAEA test, we categorize students` academic achievement level into 4 bands; Advanced, Proficient, Basic, Below Basic. We analysed the results of 2010 & 2011 NAEA Korean which are based on the same standards within the test framework. This framework follows the 2007 National Curriculum. Our analysis was conducted in the following procedures; 1) We detected test items students in AAL responded correctly more than 74% for multiple-choice items(MCI) & 65% for open-ended items (OEI) in 2 years consecutively. 2) We also reviewed “discriminating items (DI)” among those 2-year-achieved-items for more in-depth analysis. DI are items which “a large percentage of students at an achievement level can respond correctly to the item whereas at the lower levels cannot” (Beaton et al., 2012:11). 3) Finally we checked correct answer rates of students in one level below for those 2-year-achieved-items in order to understand which item was difficult(or easy) to the students in one level below. Followed these procedures we found that 20 standards were achieved by 3rd grader in middle school and 18 standards by 2nd grader in high school. We checked these items`s correct answer rate of students in one level below as well. Therefore we could determine the degree of standards` difficulty to students. Based on these analysed results, we suggested the possible hierarchy of standards in the national curriculum.