Officer Intelligence Rating (OIR) Test is an important part of the NDA (National Defence Academy) exam. It is designed to assess the logical and analytical abilities of candidates aspiring to join the Indian Armed Forces as officers. The marking scheme for the OIR Test is as follows:

1. Verbal Reasoning:
- This section evaluates the candidate's ability to understand and analyze written information.
- Each question carries one mark.
- There is no negative marking for incorrect answers.
- The total marks for the Verbal Reasoning section may vary, depending on the number of questions in the test.

2. Non-Verbal Reasoning:
- This section assesses the candidate's ability to understand and analyze visual information.
- Each question carries one mark.
- There is no negative marking for incorrect answers.
- The total marks for the Non-Verbal Reasoning section may vary, depending on the number of questions in the test.

3. Spatial Ability:
- This section measures the candidate's ability to understand and manipulate 2D and 3D shapes.
- Each question carries one mark.
- There is no negative marking for incorrect answers.
- The total marks for the Spatial Ability section may vary, depending on the number of questions in the test.

4. Mathematical Ability:
- This section evaluates the candidate's mathematical skills and problem-solving abilities.
- Each question carries one mark.
- There is no negative marking for incorrect answers.
- The total marks for the Mathematical Ability section may vary, depending on the number of questions in the test.

5. General Knowledge:
- This section tests the candidate's knowledge of current affairs, history, geography, science, etc.
- Each question carries one mark.
- There is no negative marking for incorrect answers.
- The total marks for the General Knowledge section may vary, depending on the number of questions in the test.

6. Overall Score:
- The overall score of the OIR Test is calculated by adding the marks obtained in each section.
- The maximum possible score may vary, depending on the number of questions in the test.

It is important to note that the exact marking scheme may vary from year to year, and it is advisable to refer to the official notification or instructions provided by the conducting authority for the most accurate and up-to-date information regarding the NDA exam's Officer Intelligence Rating (OIR) Test.