Richard Byrne's "Free Technology for Teachers" blog is one of my favorite reads. He shares wonderful resources and is usually pretty ahead of the game in terms of "finding it first".
Check out the link below and watch the instructional video he provides. If you are Google Drive and Edmodo user and, at times, get tired of going in between the two -- this might just be the ticket.
Free Technology for Teachers: Chalkup - Distribute & Grade Assignments in Google Drive Without Using Scripts