Preparation for next year after sophomore S&T internship

I just finished a middle market sales & trading internship last week, but I hope to move on to a BB next summer... I attend a target school. Because I was at a middle market, and the internship class and sales & trading division was relatively small, I was able to take on a lot of responsibility. I was able to do a lot of client work on the sales side from dealing with basic inquiries and developing used marketing material for sales people. On the trading side, I was able to make decisions on hedges for small trades that were actually executed by traders and paper trade.

I understand that the type of clients and cultures from a MM vary a considerable amount; A lot of the things I was able to do, I know that at a BB it would be unheard of simply because of difference of sophistication between the two types of firms. I'm a bit concerned as to what I should expect when I begin applying? And in interviews? Thanks.