Do not just download the file. Print out the "Question Type Drill" pages on pages 450–470. Tape them to your wall. Use the Cause-and-Effect flowchart every single time you solve a problem.
I recommend this book to:
The PowerScore GMAT Critical Reasoning Bible.pdf
The Powerscore Gmat Critical Reasoning Bible.pdf
Tuning Software created by Alientech which allows you to accurately interpret and edit calibration maps stored inside the Engine Control Unit (ECU).