Command Option P R not working with Bootcamp installed
Resetting the NVRAM won't make your Mac boot into OS X, which is what I am assuming you want to do.

What you need to do is hold down the Option key when booting and then select the macOS partition as your startup.

If you want to boot into macOS from Windows directly, you have to right click the Bookcamp icon and select "Restart in OS X"



For more info, please see Apple's Bootcamp Documentation