I went through the following stages:
-Employee Referral
-Interview with HR: interview was with an HR representative and 5 other candidates. (Tip: read up on the role, latest news on Citi, be an active speaker)
-Online tests: standard verbal, numeric and reasoning test
-Interview with Group Heads: 3 one-on-one interviews. Mostly behavioral questions and questions based on your CV, some guesstimate questions as well.
-Group debate and individual presentation: You get a couple of days to prepare for both. Be an active speaker during the debate. For the individual presentation, keep it concise and interesting to keep your audience attentive and engaged.