USPhO.

<p>serway and jewett isn’t bad either. i used it for the prelim and semifinal both years i made the us physics team. just keep in mind that you have to know some other stuff for the semifinal that isn’t really contained in any of these intro books. </p>

<p>also, as a heads up, the usapho is going to change pretty radically next year. last i heard, they’re probably going to move to a 3-test system like the AMC series of contests, so your mileage may vary.</p>

<p>(by the way, i’m representing the united states at ipho this year. feel free to ask questions. i definitely know how things work :P)</p>

<p>EDIT: also, you people who say the prelim got harder: what? it was downright silly compared to last year’s exam!</p>