I will tell you dates and information about GMAT exam so that you can apply for it easily without any problem.

Here is the GMAT exam pattern
GMAT Test Section No. of Questions Question Types
Analytical Writing Assessment 1 Topic Analysis of Argument

Integrated Reasoning 12 Questions Multi-Source Reasoning
Graphics Interpretation
Two-Part Analysis
Table Analysis

Quantitative 37 Questions Data Sufficiency
Problem Solving

Verbal 41 Questions Reading Comprehension
Critical Reasoning
Sentence Correction

Here is the syllabus of GMAT exam
Analytical Writing Assessment (AWA) Section - The Analytical Writing Assessment (AWA) measures your ability to think critically and to communicate your ideas. During the AWA, you are asked to analyze the reasoning behind a given argument and write a critique of that argument.

Integrated Reasoning Section - The Integrated Reasoning section measures your ability to evaluate information presented in multiple formats from multiple sources.

Quantitative Section - The Quantitative section measures your ability to analyze data and draw conclusions using reasoning skills.

Verbal Section - The Verbal section measures your ability to read and understand written material, to evaluate arguments, and to correct written material to conform to standard written English.

Here are the test centers of GMAT exam

Delhi
Mumbai
Chennai
Kolkata
Hyderabad
Bangalore
Pune
Chandigarh
Ahmedabad
Visakhapatnam
Ranchi
Kochi
Indore
Nagpur
Coimbatore
Lucknow
Jaipur

Information related to the GMAT dates
You can apply for Graduate Management Admission Test any time in the year and the registration and exam dates both can be booked as per your comfort.

You will need to schedule each test separately and the score will be valid for only for 5 years