Complex scheduling problem using SOLVER

Hi, I'm trying to optimize scheduling of meetings between individual students and individual teachers in one day.

To simplify the problem, I have the following information and constraints:

- Nr of students: 10
- Nr of teachers: 5
- Nr of available timeslots: 10
- Each student must choose 4 teachers to meet in order of preference (1-4) but will only be allocated exactly 3 meetings.
- Only one student and one teacher per meeting
- A student can meet a teacher only once
- A teacher can do one meeting per time slot
- Some students are not available in all time slots

See the attachment for how I have tried to approach the problem.



Grateful for any advice how I can solve this as I'm not so experienced using solver. Thanks