Assuming that the timetable stays static throughout the year, create a document (using LibreOffice Write, Pages, Docs, Word or whatever it is that's available),

Assuming that the timetable stays static throughout the year, create a document (using LibreOffice Write, Pages, Docs, Word or whatever it is that's available), insert a 8×5 table, and populate it. Cannot possibly be more straightforward than that. Pro tip: share it with your classmates! PS: why do you need an "app"? Do you need to tag homework/reading schedule to it?