After filling out an online application form with basic information, I had to run through a set of online tests. Although cultural fit and situational strength test appeared quite random, the outcomes are quite accurate because the participants at the following assessment day had all quite similar characteristics (open, communicative, team player). So just be yourself at the online tests - the logical reasoning test is also not too difficult.
The assessment day was quite fun, with an individual interview, a programme-related team task, and a group business game. The actual outcome in both group activities do not really matter, it is more about how you deal with certain disruptions and communicate to your team members. The individual interview is quite dull because there is no interaction - the interviewer is just reading of questions without any reaction. In general, the assessment day is fun because everyone is companionable. Afterward, you get a feedback call, which you should consider when going to the next round.
Next round was the final panel with some higher-ups. It will be five applicants together in one room sitting opposite to the executives. The interviewers were all open and friendly and had actual conversations with you - so don't worry. Not everyone gets asked the same questions, so you need a little bit of luck to get the ones that fit you. Make every answer count and be courageous, otherwise, they lose interest in you and don't ask any more questions. They will always try to challenge what you say.
Unfortunately, the feedback afterward is pretty sloppy and generic without any real effort put into it. Although the whole application process is quite pleasant, once they lose interest in you, you're not getting rewarded for the work you put in. If you're trying to apply just for the experience of applying, I would recommend applying somewhere else as the feedback is pretty useless.