How do you pick the right function to be in the bottom menu?

Im currently designing a student portal mobile application. It got a lot of functions; 1. frequently used (academic, timetable, assignments) 2. seldom used (fees, library) and 3. others that are not applicable to all students (counselling, international students, visa).

I could not figure out the categorisation of functions and where they should belong.

  1. I plan to have the bottom menu for management (dashboard, timetable, fees, notification, menu).
  2. Then, maybe have shortcut buttons in dashboard for academic, library, hostel. This shortcut is for big functions that have have a lot of features and integration in the future. Example in library, user can search for books, reserve and pay fines.
  3. And the less important ones to be placed in menu (menu in bottom navigation > sidebar).

Or would you guys suggest functions to be categorised based on usage frequency? or maybe theres other factors to be considered?

I really appreciate your help. Thank you in advance!