This is a reliable platform. Lang Wei Education is a software developed by Shaanxi Lang Wei Youxue Education Technology Co., Ltd. to watch learning videos and do problems online. At present, it includes videos and special topics of four disciplines: first-class constructor, second-class constructor, first-class cost engineer and junior accounting title. Courses include remedial classes, intensive lectures, punching classes, real problem analysis classes, case training classes, and pre-test composition classes.