The certificate is issued to persons with disabilities mentioned in the PWD Act,1995. The certificate stays valid for a period of 5 years.

You can go through this site/link mentioned below to apply for PWD Certificate:

https://www.india.gov.in/spotlight/unique-disability-id

The eligibility criteria for a person to qualify as PwD reservation are:

1. Minimum degree of disability should be 40% or more.

2. The person must have a Certificate of disability and that too made from any centre recognized by NTA-National Testing Agency.

Yes

PWD certificate is issued for minimum 40% disability.

Considering the details you have provided, you are eligible for this criteria. You can confirm this from your district hospital and then get it validated

Best of luck