A Student Officer is a student who runs part of the conference.
Student Officers conduct meetings and supervise the content of what happens in them. They lead the conference, they lead the committees, and they lead the teams that do the work. They are students, and the people they are leading are students too.
Three groups of staff are Student Officers.
The Secretariat. The senior student leadership of the conference. See The Secretariat.
The Chairs. Each chair leads a committee and runs the debate in it. See What is a Chair.
The Managers. Each manager leads a department and the members in it. See What is a Manager.
In MEDIMUN, that is the whole list. The Secretariat, the Chairs and the Managers are Student Officers.
In MEDIMUN, the Secretariat and the Managers are drawn only from students of The English School, which is the school that organises MEDIMUN. Chairing is the exception. About half of the chairs come from other schools, and at least one chair in every committee is from The English School. See Becoming staff.
If you are unsure which of these roles to aim for, start from what you want to spend the three days doing. A chair runs a debate. A manager runs a team. They are different jobs, and neither is a step towards the other.
Members are not Student Officers. A member of a department is staff, and is part of the team, and receives a certificate. A member is Administrative Staff. See What is Administrative Staff.
Delegates are not Student Officers. A delegate takes part in the conference rather than running it. A delegate is not staff at all.
Directors and Senior Directors are not Student Officers. They are teachers, not students. They are the executive board. See The executive board.
School directors are not Student Officers. They are the teachers who bring a school's delegation.
If you have seen Members called Student Officers. That is not correct. The difference is not about how much work somebody does or how senior they are. It is about whether the role runs a meeting and supervises its content.
A Student Officer is trusted with other people's experience of the conference. A chair decides how a debate runs. A manager decides how a department's work is divided. The Secretariat decides how the conference runs.
That trust comes with three things.
You are visible. Everything a Student Officer does is seen by delegates, by staff and by teachers, including when you are not on duty.
You are held to the conduct rules more tightly than anyone else. A delegate who breaks a rule affects one committee. A Student Officer who breaks one affects the conference.
You answer to someone. A chair answers to the Secretariat. A manager answers to the Secretariat. The Secretariat answers to the executive board. See The executive board.
If you are unsure whether a decision is yours to take, ask before you take it. Ask your co-chair, or your fellow managers, then the Secretariat.
Holding a Student Officer role in one conference year says nothing about the next year. Roles are applied for and appointed each year. See Becoming staff.