How to hit the ground running for first year - Incoming analyst in Coverage group

I accepted an offer a few weeks ago for a Full-time IB on a coverage group at an MM bank (Baird/ William Blair/That tier of banks) and am wondering what is the best way to prepare myself to be successful in my first year. 

For background: I come from a target school but don't have the best GPA. I was still able to land a full-time role despite this, but I was asked about it in every interview and told directly that they don't hire people with my GPA. My school is known to be pretty rigorous among other top schools, and everyone who interviewed me acknowledged this. I attribute the low GPA to a lack of focus and responsibility during my freshman year, which I said in interviews. I still have had good internships during school and good extracurriculars, and everyone I've worked with seems to like me. 

However, because of my low GPA  I feel the need to prove I belong during my first year and set myself apart from other analysts. I don't want it to be something my seniors look to when I inevitably mess up.

Is there any advice on courses or anything else I can do to ensure I'll be ready when I hit the desk? I would really appreciate any help or tips.