If you look at the FAQs section of DU Admission 2020 portal official website available at https://ug.du.ac.in/index.php/site/faq , question no# 4 says that you can make changes or update information in the application form till the last date of registration. However, there is a correction fees of Rs. 100 that you need to pay towards the changes that you make in the application form. So you can rectify the uploaded marks sheet by logging again into your account. Go to the "Edit" Button at the end of each page or session and make the necessary changes. Since July 4th is the last date for making changes to the application form, please try this out and do  not wait until the last moment. Upload the passing certificate of the qualifying exam and make sure you complete the self attestation as well. If that doesn't work, please reach out to the help desk at: undergraduate2020@admissions.du.ac.in

Hii!
Do not worry.
There are options where, in case a candidate does not have passing certificate, they can upload the marksheet too. The marksheet as well as passing certificate are given equal importance. So, it's ok if you uploaded your marksheet. There will not be any problem in the admission process.
Hope this helps.
Good luck!

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