Hi

How did you get duplicate 10th certificate?

CBSE board provides the facility of duplicate certificate . In case, if one loses 10th certificate then  he or she can apply for it and get it .
So, if you have got your duplicate certificate from your board then it is valid  one and you can use it .

But by duplicate certificate you mean some kind of xerox  then no you cannot upload the scanned copy of xerox while filling Neet application form

Also,

If you have  digital 10th certificate  from digi locker then you can also upload it because DigiLocker Issued Certificates/ documents are legally valid according to the IT Act, 2000   .

You can check the same at
https://digilocker.gov.in/cbse-2020.html

Specifications of documents to be uploaded:-

*your passport size photograph,(size: 10 kb to 200 kb)

*your postcard size photograph (4”X6”) (Size: 10 kb to 200 kb)

• your photographs  must be taken  on or after 01.01.2021 and  preferably mentioning  the name of the student and the date on which the photograph was clicked

• you shouldn't be wearing any cap or goggle,  spectacles are allowed only if you use them regularly.

• at least 80% face coverage should be there in your photographs

• your ears should be visible

• Should be coloured one

• the background should be white.

• Should be in jpg format

* your Signature  (size :-4 kb to 30 kb)

• Full signature in running hand means not in capital letters, in jpg format.

• on white paper

• with black ink

* your left-hand thumb impression (10 kb to 200 kb ):-

• with blue ink

• on white paper  in JPG format.

• Right Hand Thumb impression can be used in case of non- availability of  left-hand thumb due to any eventuality

*class 10 passing certificate (Size - 50 kb to 300 kb)

To get complete information about documents to be uploaded and application form filling process go through

https://medicine.careers360.com/articles/neet-application-form/amp

Thank you