You can add students to a Google Classroom by sending an email or by sharing an invite link or class code.

In turn, students can submit work and collaborate, as well as take quizzes with Google Forms. Previously, personal Google accounts could only join classes already started by G Suite accounts.

Google for Education has been hard at work for the new school year, with major upgrades to both Google Classroom and Google Expeditions. Plus, the iOS release of Expedtions!