sir i, in cyber cafe they uploded someneelse signature in my form what will be happened,will they reject my form

Now  you have to write to NEET at their helpdesk because if NTA doesnt notify you to chamge your uploaded images, you cannot change the uploaded signature. Please mail them at: neetug-nta@nic.in and let them know what has happened. Do let them know that it is not your signature and it needs to be changed. They will reply within 24-78 hours. You will have enough time because the correction window opens from January 15th to January 31st.