How to prepare for HF summer internship?

Going to be interning at a hedge fund (P72/Citadel/Millenium) next summer as an undergrad. Was wondering how I should prepare for it and what specific things I should know before starting. For reference I'm already going to go through Wall Street Prep and 3FS modelling alongside accounting.

I've got a reading list already and I'm currently going through the Intelligent Investor; you can be a stock market genius is next. Reminscences and stock market wizards after...

Given I have don't have a finance background, what sorta concepts would you expect/suggest I go over? Even if the topics/words seem basic (EV, Valuation for eg) please list them as even if I'm already familiar with them I'll undoubtedly see some I'm not and can make sure I understand it as much I can before my internship.

Thanks