Hello Kashish,
List of Documents Required for NEET-UG
The candidate has to bring their original documents (along with attested photocopies of certificates) for admission in MBBS BDS course.
Call Letter/ Hall Ticket/ Admit Cards of NEET-UG  exam provided by CBSE.
Result/ Rank letter issued by CBSE.
Date of Birth Certificate (if Metric Certificate does not bear the same)
Class 10thCertificate (for date of birth)
Class 10+2 Certificate
Class 10+2 Marks Sheet
Eight (8) Passport size photograph same as affixed on the application form.
Provisional allotment letter generated on-line.
Proof of identity.
DOCUMENTS REQUIRED FOR AIIMS COUNSELLING
The prospectus of All India Institute of Medical Sciences (AIIMS) states that those called for counseling have to report with the following documents/ certificates in original:
Admit Card
Call Letter issued by AIIMS, New Delhi
Proof of Date of Birth Certificate/ Mark sheet from the Board from which the candidate passed the 10+2 or equivalent Examination. 
Migration certificate from the University/Board last attended
Category certificate (if applicable) 
Current passport size photograph (front pose) 6 copies. 
One set of self attested copies of all the certificates
              
Hope it helps 
Regards 
Dr Parmanand Agarwal 
MBBS MD 
Career counsellor.