Cracking the ACT, 2012 Edition (College Test Preparation)

If you need to know it, it's in this book. Cracking the ACT, 2012 Edition has everything you need to master the ACT exam, including:

Access to 3 full-length practice tests with detailed answer explanations 2 in the book and 1 online
Comprehensive and engaging review of content covered in all five sections of the ACT, including rhetorical skills and reading comprehension for English, geometry and trigonometry for Math, and experiments for Science Reasoning
Detailed walk-through of how to write great essays
Strategies for turning complex algebra into simple arithmetic
Practice questions and explanations in every chapter
Lessons and tutorials, plus revisions and updates, available online