You can import both your students and rosters directly from Google Classroom into TypingClub.
To do this, go to the Classes tab, and click the ‘Google Classroom’ button on the right side of the screen. A new window will open where you can sign in with your Google credentials. You can then browse through your Google Classroom rosters and choose to import new classes or sync previously imported classes. Importing a class will create both the student accounts and a TypingClub class.
Once your classes are imported, you can edit all of the options (i.e. jumping ahead, scoreboard, lesson plan) as you usually would.
To start a new year with Google Classroom, delete your old classes and then import your new ones. Google Classroom will create the new classes, add any students that didn't already have an account, and pull in the existing students to that roster.