IDEA {IMPORTANT}

This is an idea on how you can improve the scheduling.

1. The classes should be srted by subject and not by year.
2. The students can be separated in different small groups. 
3. Then you can create a schedule for all the classrooms and classes deciding which group goes to which classroom at each period, depending on which group needs more time studying a specific subject.
4. You can also have different reachers for each subject and faculties for each subject.
5. This can also include having special classrooms for each subject with different requirements for each subject.