The master's thesis in Shanghai will be sampled around May. The duplicate checking of graduation thesis is usually from April to June. The time for centralized duplicate checking is the end of May. Because many schools began to reply in May, but some schools will delay until June, and some will reply a little earlier. It depends on the specific arrangements of the school, the departments of your school and the time arranged by the research group. As long as the research group agrees to reply early, you can reply early. You can check the papers in May and answer some questions in June. You need to ask the teacher the specific time.