Sahana, few Boards do not give their students Passing certificate. They give their Student's marks sheet. So even if yo uhave uploaded your marks sheet instead of your 10th passing certificate, it is still ok. And you cannot change your uploaded images even during the correction window unless notified by the NTA. If NTA considers the images not falling in line with its guidelines, it will notify you through Email or SMS and you can change them or else please consider the uploaded documents to be good.

Hello Sahana!!

Don't worry!! there will be correction window open to make any corrections in the form,and it starts in the January month from january 15,2020 to january 31,2020.For more details about this just go through the link provided below:
https://medicine.careers360.com/articles/neet-application-form-correction-guide

Hope this helps you.Thank you!!