The purpose of this study was to explore how English teachers perceive the appropriateness of the quantity and level of content in the 2015 Revised National English Curriculum. In order to evaluate the appropriateness of the modified curriculum, a survey questionnaire was administered to English teachers at elementary and middle schools across Korea. Teachers and university professors were also consulted for guidance regarding the appropriate quantity and level of content. According to the survey results, both elementary and middle school teachers believe that the quantity and level of content are mostly appropriate for students. However, responses related to the appropriateness of achievement standards for reading and writing were less positive than those for listening and speaking for children in elementary school grades 5 and 6 and middle school grades 1 to 3. In general, methods of optimizing reading and writing content in the English curriculum are discussed.