not sure how much you can do in only a couple of days but here's a broad outline of topics to prepare:
math
- linear algebra
- prob
- calculus
statistics + ml
finance
programming (python, c++, or whichever language you have experience in)
resume
i'd say projects on your resume should be of highest priority, if you can't answer questions about what's on your resume, you're unlikely to get selected
the next most important topics would be probability and statistics (this is where the green book will come in handy — it's just puzzles??? by that token all math is just puzzles!), then, based on how/what you answer, they can riff off on topics such as ml, related linear algebra or calculus
you will definitely get a question on programming, not super complicated but they will try and gauge if you have decent experience in coding (they're language-agnostic, at least in the interviews, but you'll have to learn python if you get admitted)
and then of least importance would be finance — they'll want to know if you have basic knowledge of, or interest in, the markets, they might also ask simple questions on options — black scholes, greeks and the like