You can also apply a grouping to the Gradebook, which will allow you to filter it in the same way you can with an assignment. This can be helpful to track the progress of a tutorial group, or the progress of an entire availability (e.g. internal or distance)
Edit the settings for the topic (Administration menu > Topic Administration > Edit Settings)
Open the Common module settings section
Set the group modeto Separate groups.
Change the Grouping to the relevant grouping, or leave it blank to allow staff to choose from any group in the topic.
Note: this will also affect what groups can be viewed from the participants page.
When you go back to the gradebook you'll see a new menu that allows you to choose from the groups you have selected.