Apply on the platform of off-campus institutions. If parents want to cancel the course manually at the parents' end of the off-campus training institution in Shandong Province, they need to apply for canceling the course on the official platform of the training institution. According to reports, the Shandong Provincial Department of Education, the Provincial Public Security Department and other eight departments jointly issued the "Measures for the Supervision of Pre-charging of Off-campus Training Institutions in Shandong Province". If the off-campus training institution and parents of students apply for a refund, the off-campus training institution shall immediately start the refund procedure in accordance with the refund agreement in the training contract and complete the refund in time. Fees charged according to the training cycle shall not be charged one month before the start of the new course; If the fees are charged by class hours, the renewal fee shall not be earlier than the remaining 20 class hours of this course, so as to prevent institutions from charging fees prematurely or inducing students to "hoard classes".