how can i get pwd certificate for 40% visual impairment for neet? is it compulsory to bring pwd certificate to exam centre?

Hello aspirant!
You can avail the certificate from following centres

New Delhi
Vardhman Mahavir Medical College and Safdarjung Hospital,
Ansari Nagar, Ring Road, New Delhi-110029
(Tel No.011-26190763 & 26163072)

Mumbai
All India Institute of Physically Medicine and Rehabilitation,
Hazi Ali Park, K. Khadya Marg, Mahalaxmi, Mumbai-400034
(Tel No.022-23544341)

Kolkata
Institute of Post Graduate Medical Education & Research,
244, Acharya J.C. Bose Marg, Kolkata-20
(Tel No.033-22235181)

Chennai
Madras Medical College, Park Town,
Chennai-600003 (Tel No.044-25305301)

But it is too late for availing the PwD certificate.
Hope this helps... All the best!