Introduction:
The National Defence Academy (NDA) examination is conducted by the Union Public Service Commission (UPSC) to recruit candidates for the Indian Army, Navy, and Air Force. The eligibility criteria for the NDA exam may include factors such as age limit, educational qualification, and nationality. Any changes made to these eligibility criteria can potentially affect the weightage of marks for the NDA exam.

Effect on Weightage of Marks:
Changes in the eligibility criteria can have an impact on the weightage of marks for the NDA exam in the following ways:

1. Educational Qualification:
If there are changes in the educational qualification required to appear for the NDA exam, it can affect the weightage of marks. For example, if the eligibility criteria are altered to include specific subjects or higher educational qualifications, the weightage of marks may be adjusted accordingly. This ensures that candidates with the required educational background are given preference.

2. Age Limit:
The age limit for appearing in the NDA exam is an important factor that determines the eligibility of candidates. If there are changes in the age limit, it can impact the weightage of marks. For instance, if the upper age limit is increased, it may lead to a larger pool of candidates, resulting in higher competition. In such cases, the weightage of marks may be adjusted to select the most deserving candidates.

3. Nationality:
The eligibility criteria for the NDA exam also include nationality requirements. If there are changes in the nationality criteria, it can affect the weightage of marks. For example, if the eligibility is extended to include candidates from certain foreign countries, it may require adjustments in the weightage of marks to accommodate the new pool of candidates.

Conclusion:
In conclusion, changes in the eligibility criteria for the NDA exam can indeed affect the weightage of marks. These changes ensure that the most suitable candidates are selected based on the revised criteria. The weightage of marks may be adjusted to accommodate the new eligibility requirements and maintain fairness in the selection process. It is important for candidates to stay updated with the latest eligibility criteria to understand the impact it may have on the weightage of marks for the NDA exam.