It is an essay writing section. It helps business schools analyze your writing skills. It is scored separately, and your AWA score is not used to generate your 200–800
point score. Essays are scored by a human grader and a computer grading system,  and the two scores are averaged for your final score.  You are not asked to present your own point of view on the topic; instead, you are tasked with critiquing the author's argument, analyzing the soundness of the author’s evidence and reasoning. When scoring this section, essay graders are looking for whether you can clearly identify and insightfully analyze parts of the argument, develop and organize your ideas thoughtfully and logically, and connect your statements with clear transitions.

The GMAT Quantitative section is designed to test your content and analytical  knowledge of basic math concepts, including arithmetic and number properties,
algebra, and geometry.  The section consists of two question types:
DATA SUFFICIENCY:
Data Sufficiency questions consist of a question and two statements of data. Your  task is to determine whether the statements provide sufficient data to answer the
question. This question type requires you to quickly identify what information you  would need to solve the problem and to efficiently eliminate answer choices.
PROBLEM SOLVING:
Problem Solving is a classic standardized test question type. You'll be presented  with a question and five possible answer choices. Problem Solving questions use
high school–level math up to algebra and plane geometry to test your critical  thinking skills.

The GMAT Verbal section is designed to test your command of standard written English,  your skill in analyzing arguments, and your ability to read critically. You will see
three question types in this section:
CRITICAL REASONING :
Critical Reasoning questions test the skills involved in making and evaluating arguments, as well as formulating a plan of action.
SENTENCE CORRECTION :
In GMAT Sentence Correction, you will typically face long and involved sentences.  You will be asked to find the best version of the underlined section out of the original or one of four alternatives. The sentence may contain no errors, or it may contain one, two, or more errors.
READING COMPREHENSION:
These questions test your critical reading skills, more specifically, your ability to summarize the main idea, differentiate between ideas stated specifically and those implied by the author, make inferences based on information in a text, analyze the logical structure of a passage, and deduce the author's tone and attitude about a topic.
WHAT IS A GOOD GMAT SCORE?
The Quantitative and Verbal sections of the GMAT are each scored from 0 to 60, with the mean score for Quantitative at 39 and the mean score for Verbal at 27. The score business schools and MBA programs pay the most attention to is the combined 200–800 score scale, where the mean score is 552. The tables below show the relationship between scaled scores and the test-takers
achieving them: