To sync Calendars with an Exchange account, tap Exchange when launching Calendars for the first time, then follow the onscreen instructions. And here's how you can add an Exchange account later on:
- Open Calendars.
- Tap the three-lines icon in the top left corner (skip this step on your iPad).
- Go to Settings > Accounts.
- Select Exchange and log in with your Exchange account credentials.
- Open the Calendars app.
- Click Calendars in the Menu Bar at the top.
- Select Preferences > + Add Account button.
- Click Google and follow the onscreen instructions.
You can also link your iCloud account locally through the native Calendar app.