Trading Summer Intern

I was originally part of the Sophomore Summit Program in January. Day 2 of that program included a group interview with a Associate or Director, if they liked you then you would be referred on to have a first round. During my first round I had a 1 on 1 teams call with a trader in cash equities. The questions were the routine tell me about yourself, tell me one trait about you not on your resume, why BNP, a brain teaser, and some mental math (I was asked 11^4). We had some time at the end and coincidentally I was from an area the interviewer frequented for trips when they were young, so we spoke a bit about that to end the interview. After the first round I was not pushed forward to a superday (at least as far as I know) but it typically is first round --> superday for BNP. As far as my interactions and perception of people at the firm, the one thing that really made me want the internship was the nurturing culture that they have. I know they are notorious for skimping on bonuses (this was acknowledged by an alumni from my school I spoke to) but having a small but quickly growing team was something that I wanted to be a part of.
One thing that I want to stress is how important networking was for this. I ran through some of the questions with multiple alumni who work there and had access to the question bank which helped make my answers as solid as possible.