There are no set guidelines as to why would an application be rejected and so we cannot be sure of whether you will receive your Admit card or not. But 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.

Now if your application is rejected then you should have got atleast a message or notifications regarding your NEET application about any mistakes you have performed and have to rectify it. Also if the application is rejected then the probability is you will not be able to download the admit card so that way also you can verify the status of your application.

I hope my answer helps. All the very best for your future endeavors!