Good luck with this mate,
I have went twice to this but failed the both times, I think I was very close to being hired as I was offered twice to the AC.
I can leave you the feedback that I got and some advise you could use for your benefit.
The feedback I got was:
You were very professional in the role play and was the strongest candidate in that - the reason I got that good feedback is because I acted very calm and polite, welcomed the hypothetical customer to the bank offered him water and the introduction was really nice and professional the assessor said. I also had relevant arguments for my assumptions and advise and I responded confidently when he challenged me. Your interviewer WILL challenge you that is nothing personal only to check your reaction.
In the group exercise I had neutral/a bit negative feedback. The assessors though I was really calm and could have been more assertive while I mad some of my point, but the plus side was that I had relevant comments and was talkative but not dominant in the discussion. In my first AC I was too aggressive in the group excersice but now I was too passive you must find this balance. I am the type of person that very seldom gets stressed and I was in no stress there but I clearly saw that most of the other applicants were very stressed in the group exercise I believe it is not that big of a minus being a bit stressed as it illustrates your respect and motivation to work that. I believe it was even a small minus for me to be too “cool”.
I had two individual interviews as well and messed one of that interview up badly. I had talked to some 12-15 people in the bank before I talked to him and I had asked in detail what I would be doing in the internship to that people. I didn’t ask anything job related in that interview and that is a BIG minus as I came across unmotivated and probably as “one of those who are only here for the potential $$$ he will make”. Make sure you ask about the job and be enthusiastic about the job. That is what they are looking for, you will get as well highly technical broad question which you cannot prepare for really. Just stay current with the financial world, what has happened, what transactions are currently in the making, what would you have done in this situation and so forth. I was able to answer all of these questions fairly well I believe exempt that I was not able to name that Japan bank that bought Lehman Asia operation which was Nomura btw.
Bottom line is: stay current, be confident, be enthusiastic, be professional, be highly motivated and be highly motivated!!
It is very difficult to get in there and they are very intelligent, professional but nice to you. They slightest mishap can get you out of there I got even a minus for my nonverbal communication, everything counts!!!