Read more about this tool in my blog post, "Faster Google Classroom Assignments with a Bookmarklet".

The title will appear in your web browser's bookmarks.
Indicate how you will delimit student names in the next section.
This helps when copying from another source.
Partial matches are supported, e.g. "Drew" will match "Drew Smith", "Andrew Smith", or "Mike Drews".
However, each name must match exactly one student in the class. Otherwise the bookmarklet will abort to avoid unintended changes.
If multiple students in a class share a name, enter those students by their full name.
This tool is not endorsed or supported by Google.