Time Table for teachers

The membership system has been removed, making it more convenient to use.

1. Help teachers plan teaching time,
2. Help teachers remember students' names, and put students' names in the classroom to facilitate classroom memory
3. Help count the number of teacher hours
4. Long press on the main page, and other corresponding operations can pop up almost everywhere.
5. If you need to adjust the class temporarily, you can set today or tomorrow's course on the main page
6. Statistics of courses have total statistics and statistics for each class
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