I have my first-round interview for an internship at an MBB scheduled in around a week and am currently thinking if I am really ready to succeed. I generally feel good about casing and also think my interviewer will understand that I REALLY want to work at their firm during the fit part of the interview (I still need to prepare a little more on the various questions that come up but have a good feeling about the fit).
Still, I am worried that I will not pass to the next round simply because I may be good, but not "good enough". This has actually happened to me last year when I was interviewing for an internship at another firm - I realised that one of the cases was quite bad, while I had a good feeling about the second one. In the end, I was told that the second interview was good, but "not good enough to pass". Of course, I already knew that I probably wouldn't get the internship because I messed up the first case, but I was still surprised to hear the feedback about the second case.
Now I am a little worried that this will happen again and am wondering: what is the bar to pass an interview round? Does everything need to be top-notch or some small mistakes okay? Do I need to be among the top 5% or 50% (or something in between) to get to the next round? Is it normal that I have these doubts or should I try to reschedule to get more time to prepare?
Thanks a lot for your insights!