Downloading Google Classroom and joining with a teacher’s link
On Android → Open Google Play Store, search Google Classroom, then tap Install.
On iPhone (iOS) → Open App Store, search Google Classroom, then tap Get.
Open the Google Classroom app.
Sign in with your Google account.
Your teacher will give you a join link (something like classroom.google.com/c/XXXXXXXX).
Tap on that link (from WhatsApp, email, or text).
It will open directly in Google Classroom and show the class.
Tap Join to become a member.