When students complete work in Google Classroom there is not a notification to alert the teacher that it has been submitted. In a mastery learning model we want students to continue to revise their work until they reach the desired level of mastery. If work is being submitted after you have already given feedback it can be easy for that submission to be overlooked.
If a student leaves a private comment in Google Classroom the teacher will receive an email notification and link to the assignment. Instruct students to leave a private comment asking for feedback when turning in assignments for revision.
Post a New Assignment
Knowing that several of my students needed me to take a second look at their project after the first round of feedback I posted a new assignment to Google Classroom. Students are asked to add from Google Drive the assignment they previously submitted.
This system of posting a new assignment makes it easy to locate student work in need of feedback. The student documents are added to a new assignment folder in Google Drive, thus allowing me to access all of the student documents at once in Google Drive. The files are not removed from the previous assignment folder. In other words, the documents are in both folders in Google Drive.
Since I number my assignments, if I am asking for a resubmission of a specific assignment I will give it the same assignment number and add the letter b to it. Thus what was originally assignment #023 I will ask for resubmissions as #023b. If I am posting a general resubmission opportunity where students can resubmit any work they have worked on then I will use the next sequential number.
Note that students must be the owner of a document to turn it in. When students submit a document in Google Classroom the ownership is transferred from the student to the teacher. If the teacher still has ownership of the document the student will not be able to submit it to a new assignment. Either you have to return the document to the student or the student needs to unsubmit from the previous assignment.