Generally photograph and signature are two important documents must for applying NEET. 

Students have to meet specifications for both else applications form cannot be submitted. Specifications shared below. 

https://medicine.careers360.com/articles/neet-application-form

Make sure you have valid Id proof and registered email and An Active Mobile Number. 

Hello Soumyaranjan,

The online application form will be filled from 1st November to 30th November 2018.

The documents required for apply to NEET exam are:

1. Students Passport size photo with name and date.

2. Stidents Signature.

3. 10th and 12th board exam details and 10th marksheet.

Also Do not use BLOCK LETTER for signature.

Hope this will help you. Best of luck.