What should I do summer before college freshman year to get into good business clubs and what should I major in

(1) I will be attending Emory University at the Atlanta campus this fall. In high school, I had good grades and a high SAT score, but my extracurriculars were kind of generic, like Quiz Bowl, Model UN, Mock Trial, etc. Also, my school didn't offer any courses related to business or economics. I didn't do anything related to business or finance except a couple of things here and there. So my knowledge is minimal. I know that the recruiting timeline for IB and Consulting keeps on moving up and getting an internship after freshman year summer is essential for Wall Street. The business clubs seem to be very competitive at Emory(it could be like that at other schools too, but I don't know), but I don't know what I would put on my CV if I don't get into them. Anyway, what are some things I should do to maximize my chances of getting in. What should I learn? Are there any technicals I should grind? What would be the best strategy to get into those clubs for someone who doesn't have any finance experience in high school. I was honestly planning to just lay low this summer because I worked hard in high school, but if there is something I should be doing, then I will do it. 

(2) Also, what should I major in? I'm currently thinking of doing either Finance+ Accounting or Finance+ QSS(kind of like applied data science they teach R, Python, SQL, Java and stuff like that). I've heard that majoring in something like QSS would make me look better, but it could also potentially compromise my GPA. I'm also not sure how relevant it would be to IB or consulting. If I do major in Finance+Accounting, I will make sure to take a few CS and math classes. I'm also hoping to break into MBB or BB IBD(I know it's impossible from my college, but why accept defeat even before I start), and I've heard they like technical majors, so what is your opinion on what? I should major in for those places.

Thank you for reading this long post