Absences Record for both iPhone & Android

Hello, I want to create absences record system app for iPhone & Android. The app willbe used on a school Where the teacher can take student absences for his class. We have 7 seminar in a day from Sunday to Thursday so the app section will be: - Login System: There will be 3 types of accounts Administrator, Moderator & Teacher each has it own permissions. - Display Classes: When you login it will display all the classes in the school which will be added by the administrator only aslo he can remove/edit the class. - Display Calendar: When you click on the class I will display the calender ( not phone calender but app own calender ) Where the user can click on current day so that he can take student absences for this class. - Display Students: When you click on the current day in the calender I will display students name and 7 seminar where the user can use checkbox to take student absences after that the Teacher must click on Submit button to confirm the absences and he can't change the absences after that the only use can edit the absences is the Administrator & Moderator only. - Student Info: When the user click on student name it will desplay his name, Image, his class & the number of absences with the day, date for each absences & feild for notes for each absences. User Types: - Teachers: can display classes, student name & student info also he can take absences. - Modaretors: all Teacher permissions also he can edit/take absences for specific classes and can add/remove students for specific classes. - Administrator: all Moderator premissions also he can add/remove classes and assign a specific class to a specific Moderator so that he can work on it. Regards, Fahad S. Aldaferi