Very informal and subjective interview, in my opinion. Your success depends a lot on your networking skills and whether they like you. Of course, you do need a strong background in what the job is asking. Try to win over the interviewers and swear you want to change the world. After the panel approves you, HR will contact you 2 or 3 references and ask them about you. Have them prepared for this call. Also, the IDB does not run any medical or drug tests at least at the consultant level.