Go to classroom.google.com and click Go to Classroom. Enter the email address for your Classroom account and click Next. Enter your password and click Next. If there is a welcome message, review it and click Accept. If you're using an Google Workspace for Education account, click I’m A Student or I’m A Teacher.
Sign in - Google Accounts - Google Classroom
You can use Classroom in your school to streamline assignments, boost collaboration, and foster communication. Classroom is available on the web or by mobile app. You can use Classroom with many tools that you already use, such as Gmail, Google Docs, and Google Calendar.