<p>What I would do is watch the videos and do book problems. If you know where to look you can get the answer keys to the book problems for free (the name of the book is Thomas Calculus 11th edition). Also Calculus for Dummies is really good to understand the fundamentals (how to differentiate, integrate and some the basic techniques) but its not enough to study for an AP test. I would use Calculus for Dummies when ever you don’t understand a general concept, because it will explain it in very coherent language rather than a cluster of variables.</p>