GMAT Verbal section is designed to measure how you analyze arguments rationally with the information provided as well as how you think critically. Yes, your command of standard, written English needs to be sound. More than you might think, a large part of your professional success will be determined by your level of English proficiency and verbal intellect; the fact remains that English and reading mastery trains you on how to think critically.
GMAT Verbal 700+: Most Comprehensive Question Bank course has been compiled after months of thorough research and after going through various GMAT discussion forums, previous years questions, expert opinions etc. The course is divided into three sections with 80 questions each - GMAT Verbal: Critical Reasoning, GMAT Verbal: Sentence Correction, and GMAT Verbal: Reading Comprehension.