main function
1. To-do: Easy and simple to-do management
2. Academic Calendar: Easily grasp the schedule at a glance in the monthly calendar format
3. Attendance matters: attendance, absence, attendance recognition status management and statistics
4. Checklist: Manage, statistic and search various checklists such as revenue inspection, one person, one station, etc.
5. Evaluation: Manage, statistic and search by high or low
6. This week: weekly attendance, check, evaluation, class, memo management and search
7. Timetable
8. Attendance
9. Counseling Journal: Register for Counseling