Ap chem exam

<p>well, as many of you know, ap exams are approaching pretty fast. My ap chem exam is in two weeks, and i am having major problems with acids and bases. Does anyone know of any good sites that go over this topic? i know it is big on the ap exam. </p>

<p>and for those who have taken the ap chem exam, just how hard is it and what should i really focus studying on?</p>