<p>I took AP Chem last year and I crammed using Barrons but like half way through I realized that the material was too dense so I switched to TPR. TPR is definitely a lot easier to get through especially when cramming!!!</p>
<p>I feel like an idiot for asking this, but what does PR stand for?</p>
<p>Princeton Review. </p>
<p>
</p>