On CodeHS Pro you can configure your Gradebook to show only the activities you want. Click Configure on the Gradebook page and select "Quizzes" or "Exercises." For example, if you select "Quizzes" the Gradebook and export will only show students' grades for quizzes (it will hide everything else).
Note: This does not impact students' grades for quizzes or exercises, it simply hides the activities based on what you want to see at that time.
The CodeHS Gradebook is only available on Pro. To get Pro for your school, contact our team at firstname.lastname@example.org.