SA prep as a non-finance major

Hey all,
Currently an incoming SA as a non-finance/econ major. During my preparation for the interview stage I spent my time studying the BIWS guide which gave me all the technical knowledge I currently retain for the internship. I haven't had the opportunity to take any finance/accounting courses, so all of my knowledge is simply stuff I have memorized. Should I be watching YouTube tutorials on building out any sort of models / practicing prior to the summer? I understand that the majority of work as a SA isn't intense/modeling related and your return offer is more dependent upon you clicking with your group, but I also don't want to appear as an unprepared idiot. How in-depth is my training week going to be (at a BB), and what should I do to be as prepared as possible?

Appreciate any advice.