Follow these steps if you are trying to sign in to a Google Account for a child under 13:

1. From parent's Chrome browser, click https://g.co/YourFamily
2. Click on the supervised child account. (If the family group is not created yet, create one and link the child by sending an invitation from this link and accepting it from the child's email. Then continue with Step #2)
3. Click "Go to Family Link"
4. Click "Account Settings"
5. Click "Controls for ThirdParty apps"
6. Select "No let child sign in to apps that only request basic info(name, email, and language preference) without me"
7. Login to courses.ahaguru.com using the child account

Click here for other Google sign-in issues.