Does this always happens if there is a mismatch occuring in neet application form and uploaded document NTA always mails u regarding the errors or they straight away reject ur admit card and u will come to know at the day when neet admit card is out

NTA does not look into the errors of the application form because it doesn't know your details. For example, let's say you wrote your Father's name wrong. NTA would not know that because NTA doesn't know you personally. So NTA will consider that the information in the application is correct because you filled it. But then lets say an uploaded document like your 10th certificate or a Photograph or Signature are uploaded with incomplete information or not meeting the guidelines, then NTA will notify you at your Registered Email Id and you will have to make the necessary changes. That is the correction window for. In your case, now that you have sent NTA a mail, though it is highly impossible to not to panic, we would advise to wait to hear from NTA because at this point in time, honestly there is nothing in your jurisdiction except for waiting to hear from them. You cannot go back and edit your application because the correction window has been long closed. You can only hope for the best at this point in time. The possible instances in which any NEET application might be rejected are:

• If an incomplete application has been submitted.
• The same Candidate has submitted different application forms
• If the details mentioned in the application do not match with the document that you have uploaded.