Hi Shweta,

Yes, you can easily check out for the answer keys of upsc combined medical services through  officiak upsc or other different sites.

Here is one such link which may help you out:-

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.freshersnow.com/upsc-cms-answer-key/&ved=2ahUKEwiO2IvdlcnjAhXNfX0KHZz9AhcQFjAAegQIARAB&usg=AOvVaw0Yl4cBJDUI3i2b7inQxswr

Good luck.