The GMAT (Graduate Management Admission Test) is a standardized test used for admissions to graduate business programs, such as MBA, Master's in Finance, and Master's in Management programs. A significant portion of the test is the Data Sufficiency section, which is unique to the GMAT and assesses your ability to analyze and draw conclusions from data. Here are some tactics for rapid decision-making in the GMAT Data Sufficiency section:

 Understand the Format:

- Each Data Sufficiency question consists of a question followed by two statements.

- You're not required to solve the problem, but to determine whether the information in the statements is sufficient to answer the question.

 Tactics for Rapid Decision-Making:

1. Start with Statement 1 or 2: Choose one statement and analyze it first. Don't worry about the other statement or the question yet.

2. Use the Information Given: Only use the information given in the statements; don't make any assumptions or bring in outside knowledge. 

3. Eliminate Unnecessary Calculations: Data Sufficiency questions don't require you to solve the problem. If you can determine sufficiency without calculations, do so to save time.

4. Analyze the Question Carefully: Understand what's being asked. Sometimes, rephrasing the question can provide more clarity.   

5. Consider Multiple Scenarios: If you're unsure about the sufficiency of a statement, consider multiple scenarios or examples to test its sufficiency.

6. Look for Patterns: Sometimes, the relationship between the statements and the question follows a pattern. If you recognize a pattern, you can answer quickly.   

7. Check for Redundancy: Statements that contain the same information in different forms are often redundant and can be eliminated.

8. Consider the Data Types: Pay attention to the types of data given in the statements (e.g., integer, positive/negative, odd/even) as they can provide clues to sufficiency.

 Time Management:

- Each Data Sufficiency question should be answered within two minutes.

- If you're spending too much time on a question, consider making an educated guess and moving on to save time for later questions.

 Practice Regularly:

- Practice with a variety of Data Sufficiency questions to become familiar with different types of problems.

- Analyze your mistakes to understand where you went wrong and how you can improve.

The GMAT Data Sufficiency section can be challenging, but with practice and the right tactics, you can develop the skills to answer questions efficiently and accurately. Remember, the goal is not to solve the problem, but to determine whether the information provided is sufficient to solve it.