From what the advert mentions, plus advice for any interview.
These are questions asked in most interviews. Prepare an example from your own work for each.
Two minutes: your current work, one or two achievements, and why this job is the next step.
Show you've read about the organisation and its work in South Sudan.
Pick one example from the job's main duties and say what you did and what changed.
Situation, what you did, and the result. Keep it to one clear story.
Give a real example from a team, community or clients.
Always ask one or two: about the team, the first months, or how success is measured.