Advice for a high school senior wanting to end up in Sales at an investment bank

My junior year just ended and I will be starting my senior year in a couple of months, and will be applying to colleges in august. I know the whole run down of target schools in Texas, which is where I live, and the school I want to attend is A&M in college station. Im aware that UT Austin’s business school is the best and most likely to place someone in an Ib when they graduate, but I don’t think my grades are quite good enough to be accepted, and I also think I’d like living in college station rather than Austin. I’m seeking advice on what to do it i get accepted into A&M. College is very overwhelming and I understand that networking is a very important part of landing an IB job,so advice on how to network and what things to do to put me into the position to where I can get myself a job in ib sales is what I need.