The NELTS test is based on China New English Curriculum Standard, China English Proficiency Scale and other relevant domestic standards, with reference to European * * * Same Language Reference Standard (CEFR), American * * * Same Core State Standard (CCSS) and other international evaluation standards, combined with the eight-year evaluation big data of NELTS, and under the guidance of English linguistics experts from Beijing Normal University, * * * has devoted itself to research and development.