Having a different name on your 10th marksheet and Aadhar card might cause some issues during registration on the CSAS portal of Delhi University,

During verification, the mismatch between your names on the application and documents (marksheet and Aadhar card) could lead to delays in processing your registration.

If possible, prioritize getting your name rectified on your 10th mark sheet. This is the ideal solution as it eliminates discrepancies across documents.

Contact your school authorities and inquire about the process for name correction on the marksheet. It might involve submitting an affidavit and relevant documents as proof of the error.

If correcting your marksheet name isn't feasible immediately, proceed with your CSAS portal registration. During the application process, look for a section where you can mention the name discrepancy. Clearly explain the situation and mention that you are in the process of getting your marksheet name rectified.

If the CSAS portal allows uploading documents, consider attaching a signed affidavit on a notary stamp explaining the name mismatch and your efforts to get it corrected.

https://www.careers360.com/university/university-of-delhi-delhi

I hope it helps!