The school will issue a timetable with course time and teachers on it. According to the talent training plan, sophomores should choose courses, and arrange a class schedule by themselves in combination with the schedule time (it is recommended to arrange more than two copies). Write down the course code (five digits, such as 13253) and the course time code (three digits, such as A07) on the schedule. Then one day, the school will inform everyone that the course selection system is open, so go to the course selection system (the digital campus selected by the school homepage is the one that enters the Lily platform) and choose courses according to the course code and time code.