Quote from Hydroblunt:
First interview does not mean much, it's later on that counts. I honestly think they do it for a little promotion more than anything.
Mine was a while back, the guy asked some questions, checked out my Ebay business which I had at the time, tried to be a hard interviewer but I did not budge and did not really care. Said to call him after I get some experience.
Truth is that it's so hard to get in there that you almost have to know someone pretty well to get a position. Nepotism all the way. Or be super duper Ivy league.
They will try to grill you, put a stress test on you. Try to make you feel that you do not belong there, which you probably don't. If you show signs of that, no chance for a call back.
They get 100s of resumes and have few openings. And if there are 5 other interviewing kids with close connections to the senior traders, well, hate to tell you but you have no shot. Luck of the draw.