Dear Hima, 

For the Basic Registration, before start filling the application form of AIIMS MBBS 2019, aspirants must keep the following things/documents ready to avoid last minute confusions:

1. Scanned image of passport size photograph.

2. Scanned image of the signature.

3. Copy of left hand thumb impression.

During basic registration, you will only fill in details like Nationality, Personal details, AIIMS preferences, Contact Details and Declaration form. You only need your I'd details during final registration process. 

Now Supreme court has told that Aadhar card is not a mandatory document for admission process. So you can choose another document.