Self studying AP Env. Sci?

<p>I started studying APES over the summer, but stopped and took a 4 month hiatus and just restarted last week. I use Barron's and read 2 chapters every weekend in order to finish the book by next month. I haven't found the "smarty pants guide to APES" that several have recommended, should I bother getting it or just sticking to Barron's?</p>