While I won’t deny that some programs out there are like this, this is certainly not the norm anymore. I’m sorry you had such a poor experience, as I will assume this post comes from a place of personal experience and not just what you think it might be like. But that is no reason to give such an unhelpful response to an earnest question.
OP, in terms of texts, for a prelim going into another specialty, the best/easiest to get is probably the Fiser ABSITE review. It will have useful chunks of info in a readable format you can carry in your pocket and will have something to say on most basic Gen surg scenarios.
If your program offers the ACS Fundamentals of Surgery course beforehand (not all do) then definitely go through those scenarios. I found that helpful as a pre-intern.
General precepts: Show up on time, if you finish rounding early offer to help other teams, if you are concerned that a patient is “sick or dying” then load the boat early by calling your senior.
You can’t do much right now to prepare except order Fiser. But you can do things like get your dental checkup, have a physical if you need one, figure out how to make some healthy meals that you can meal prep ahead of time for when you are actually an intern.
Good luck!