best prep for AP lit, AP Calc AB, and AP Bio

Test Preparation
1

<p>What are the best prep books (in-depth) for the 3 APs listed above. Thx</p>

2

<p>A.P. Bio - definitely cliffs, no competition</p>

3

<p>Im interested in AP Calc AB, AP Lit, and AP Chem as well. I've narrowed it down to the SparkNotes PowerPacks for Chem and Calc (mostly for practice tests though) and respective PR books; and PR or Barrons for Lit. Any comments?</p>

4

<p>PR is the BEST for ap chem. trust me</p>