Actually TeacherKit doesn't support "Sync" across devices or platforms yet, however it is currently in our road-map.
You can use the same account on multiple devices. but unfortunately they won’t sync.
All your data is saved locally on your device. We don’t store your data on the cloud.
We are working on bringing the sync solution to TeacherKit but it’s still on it’s early stages.
For now, you can use the Dropbox backups to share your data to all your iOS devices:
Please don't hesitate to contact us anytime if you need any help.