This question belongs to GRE category.

Yes, it is possible to request a change in category for reservation after taking the GRE exam. However, the process and eligibility criteria for such a change may vary depending on the specific circumstances and policies of the organization or institution administering the exam. Here are some key points to consider:

1. Eligibility Criteria:
- Before requesting a change in category, it is important to review the eligibility criteria set by the administering organization. They may have specific guidelines regarding the time frame within which changes can be made, as well as any additional requirements or documentation needed to support the request.

2. Contact the Administering Organization:
- The first step is to contact the administering organization, such as Educational Testing Service (ETS), which oversees the GRE exam. They will be able to provide you with the necessary information and guidance on how to proceed with your request.

3. Explain the Reason:
- When requesting a change in category, it is important to clearly explain the reason behind your request. Whether it is due to a change in personal circumstances, a mistake in the initial category selection, or any other valid reason, providing a detailed explanation will help support your case.

4. Documentation:
- Depending on the nature of the change, you may be required to provide supporting documentation. For example, if you are requesting a change in category due to a change in personal circumstances, you may need to submit relevant documents such as proof of residency, legal documents, or medical certificates.

5. Deadline:
- It is crucial to be mindful of any deadlines imposed by the administering organization. Requesting a change in category after a certain deadline may not be possible, so it is important to act promptly and follow the guidelines provided by the organization.

6. Additional Fees:
- Some administering organizations may charge additional fees for processing category change requests. It is important to inquire about any associated costs and make the necessary payments if required.

7. Follow-up:
- After submitting your request, it is advisable to follow up with the administering organization to ensure that your request is being processed and to obtain any updates or further instructions.

Remember, the specific procedures for requesting a change in category for reservation after taking the GRE exam may vary, so it is important to consult the administering organization for accurate and up-to-date information.