<p>I found my brother's old physics book from 1999. It's by the Princeton Review. My physics teacher says physics hasn't really changed dramatically over recent years. So do you think I need to buy a new one?</p>
<p>You won't need to buy another one to learn the concepts, but I would recommend taking tests from books written before 2005.</p>
<p>^ I think he means after 2005.</p>