You can find the shared document in your assignment as an attachment.
If you are signed into Google, click on the assignment and it will take you to view it. Click on “Open with Google Docs” in order to work on your individual document.
You can also find all your Google assignments by going to “Shared with Me” to browse or search for the name.
Pro Tip: Create a folders in My Drive where you can organize and keep track of these documents as they are assigned.