If you're having trouble connecting to Google Drive with a work/school email this, it's most likely a permissions issue that needs to be resolved by your Work or School's Google Suites admin.
The admin will need to do the following to allow the Rocketbook app to access your list of folders:
- Go to Google Suites and log in
- In the Google Apps Control Panel, select Apps
- Select G Suite
- Select Drive and Docs
- Select Data Access
- Make sure Drive SDK -- Allow users to access Google Drive with the Drive SDK API is checked