Hey there. 

There are various books with previous years solved paper of NEET PG MDS by different publications that are easily available in the market and online. 

You can choose any from those. If not that then a simple google search may provide you with the previous years websites. There are various websites that have those questions. 

Other than that, as for now, you can check out the sample papers through this link: 

https://medicine.careers360.com/tags/sample-paper-of-neet-mds

Hope this helps.