yes, It could matter depending on the situation and the requirement for identity verification . if your father middle name includes in the  documents  but board admit card  omits it by mistake .

in these kind of discrepancy  especially in the situation of board admit card . following are steps you can do

1. Contact the board authorities
2. Provide affidavit
3. Correct the document
4. Keep both document ,in case you need to explain the discrepancy .

Hope it will help you .

A discrepancy between your father's name on your Aadhaar card and your board admit card, such as the presence or absence of a middle name like "Kumar," may or may not matter depending on the situation. Minor differences in middle names are often not an issue, but they could potentially cause confusion during official processes like college admissions, government documentation, or competitive exams where strict identity verification is required.

If the difference is flagged by authorities during document verification, you may be asked to clarify or provide additional proof to verify that both names refer to the same person.

To avoid future complications, it’s best to ensure that your father's name is consistent across all your official documents. If it’s not, you have a couple of options:

1. **Update the Aadhaar Card**: You can correct your father's name in the Aadhaar card by visiting an Aadhaar enrollment center or using the online service on the UIDAI website.

2. **Get an Affidavit**: You can also create a notarized affidavit declaring that both names refer to the same person, which is often accepted by institutions in case of minor name discrepancies.

Taking action now will save you potential hassle in future official processes.