Book recommendation please! (USPhO)

[darkinvader]

<p>What's a good book to study off of and one that contains nice and challenging problems which may be comparable to that of the USPhO Semi-Final Exam or higher? I couldn't make past the Semi-Final Exam to make camp last year, but I'd like to do so this year. </p>

<p>I heard Halliday and Resnick, and Irodove General Problems in Physics were good.</p>

<p>Any suggestions, recommendations or advice is welcome. Thanks!</p>

[AstroBlue]

<p>Hey! Another person trying to make the camp!
I’m working through the Halliday chapters that I don’t remember/didnt cover in physics C. And then I’m just going to do a bunch of practice olympiads from different countries and other sources.</p>