A photo id is a must. 

Aadhar card,  driving licence,  passport will do.

Bank passbook might not be accepted. 

Reach an hour before the commencement of the exam to avoid any hassle.

Good luck 

Things you need to carry on the day of examination are as follows:

1: Valid Photo ID proof - They ask for Adhar card. Though any official ID proof that has your photo on it is okay, if your bank passbook has your photo on it, it can be considered or else you'll have to carry some other valid photo ID proof.

2: NEET admit card - The most improtant.

3: Passport size photograph-  The photo should be same as in application form.

Make sure to reach the center 90 minutes prior to exam and do not carry watches or any electronic device.