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Koraljka,

The diagnostic test in the Official Guide for GMAT Review will help you get a feel for where your scores range in each of the sections of the GMAT exam, and the answer explanations will give you feedback on what you got wrong and why.

Sentence correction, of all the sections, focuses the most on English grammar rules.  Chapter 9, the Sentence Correction chapter, has a 4-page section on basic English grammar rules, that will give you guidance, but if you are really getting stuck, it might help you if you found a local tutor for more difficult concepts. To get even more practice with Sentence Correction problems, The Official Guide for GMAT Verbal Review is completely dedicated to the verbal component of the exam and includes 113 additional sentence correction questions that are not in The Official Guide for GMAT Review.

Finally, using the free GMATPrep software will help you guage your progress. You can use the 2 free tests as a way to see how your studying is helping you reach your goal.

Natalee,

The best book to start with for studying for the GMAT exam is The Official Guide for GMAT Review. It is the only book on the market that uses questions from past GMAT exams, so you know the questions are authentic. There is a comprehensive diagnostic test at the beginning of the book that will give you guidance on your strengths and weaknesses. From there, you can begin your studying with the topics that are most difficult.  Additional practice on Quantitative questions can be found in The Official Guide for GMAT Quantitative review, which has 300 questions that are not included in the main edition.

If the quantitative section is the area you are most concerned with, a GREAT place to start is GMAT Focus.  GMAT Focus is a quantitative-only diagnostic tool that assesses your answers to 24 quantitative questions and breaks down your weaknesses not only by section (problem solving versus data sufficiency) but also by question type – word problem versus straight math problem, algebra versus arithmetic. It will also analyze how long you are spending on questions so you can work on your timing, and there is also an option to track the questions you are guessing on to see if you are guessing accurately. GMAT Focus is computer adaptive, so it also gives you an estimated score range and you can take up to 4 assessments without seeing repeat questions.

Thank you for your excellent question. Because the GMAT is an adaptive test, people see different sets of questions. Scores are not based on the number correct. Rather, scoring is based on the difficulty of all the questions that a person has seen, whether the person got each of those question right or wrong, and the number of questions he or she answered. The scaled scores (0 - 60 for the Quantitative and Verbal sections and 200-800 for the Total score) are transformations from your performance on the Quantitative and Verbal Sections. These transformations are designed so that the scores represent the same ability level over time. A 550 in 2009, for example, represents the same ability as a 550 did in 1997. Because of constantly increasing ability of GMAT test takers over time, today’s mean is higher than in past years and percentiles that correspond to each score has changed.