Google Classroom is great, but it is lacking a few keys features. Schoolytics is FREE, and allows you to get (among other things):

1. Student Progress Reports

2. Track Assignment Tags

3. Student Work Submissions

4. Create Student Groups

5. Reuse Assignments

Here are some Teacher Guides for getting started and answers to frequently asked questions.

When new users sign up with a lot of Classes, sometimes it takes longer to sync the first time. Teachers can refresh their Classes independently by:

1. Going to the Classes page

2. Clicking Manage Classes

3. Clicking the refresh icon

4. Pressing Connect