Winners Guide to GMAT Grammar & Sentence Correction. Someone whose first language is not English. In fact there are hundreds of brilliant students from the Non English speaking world, who easily score in the 99 percentile in GMAT Math, but struggle desperately when it comes to GMAT Verbal. Even if you are comfortable with the English language, you might struggle with the 700 type of questions, where the GMAT Sentence correction section tests deeper understanding of Grammar rather than just testing the standard rules that the commonly available guides provide. It gives you a concise background of the English Language without going into details that you do not require for the GMAT Sentence Correction section It explains, with multiple examples, the essential concepts and structures of GMAT Grammar. It takes you through the common concepts tested on the GMAT Sentence Correction section and provides detailed background so that these concepts are easier to absorb. Provides a comprehensive list of GMAT Idioms (Over 200 Idioms tested in the GMAT) Over 150 unique Sentence Correction Questions with explanatory answers.