Kaplan GMAT Verbal Workbook (Kaplan Test Prep)
Kaplan GMAT Premier 2015 with 6 Practice Tests: Book + DVD + Online + Mobile (Kaplan Test Prep)
Kaplan GMAT 800: Advanced Prep for Advanced Students (Kaplan Test Prep)
The Official Guide for GMAT Review 2015 Bundle (Official Guide + Verbal Guide + Quantitative Guide)
The PowerScore GMAT Critical Reasoning Bible