Is business school necessary for investment banking?

Hi, I am currently a senior in high school who is interested in IB. A lot of good universities nowadays offers a business school which is usually harder to get in. (ex. NYU offers NYU Stern as its business school) Do you think I can break into IB by majoring in economics(which is usually offer outside of the business program) rather than going to the business school?

if the school you go to has a bschool you want to be in there but if not econ is fine