Make sure to back up your device if ever you change your mind.
You have 2 options. You can pick which data you want to remove so you don't have to set it up again or delete everything in the iPad.
Option 1: PICK WHAT YOU WANT TO DELETE
Step 1: Go to Settings
Step 2: at the top, there's an Apple ID area below the word Settings. Tap that.
Step 3: Disable Keep a Copy of for all.
Step 4: Tap Sign Out
Step 5: Tap Sign Out
Step 6: go to Messages. Disable iMessage (it shouldn't be green)
Step 7: Delete or logout of all messaging and social media apps.
Step 8. Check Photos if it's cleared.
Step 8. Open the SeriousMD app
Tap Settings
Tap Login and Security
Tap Log Out
Login with the account of your secretary.
Make sure it syncs until it says "SeriousMD is up to Date"
Step 9: Last step
Triple check if there are any other apps you missed or any other sensitive data you might have missed, like the "Files" app
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Option 2: ERASE ALL CONTENT AND SETTINGS
Step 1: Go to Settings
Step 2: Tap General
Step 3: Tap "Reset"
Step 4: Tap Erase All Content and Settings
If it asks for the pin code, then enter to proceed.
You can then reconnect it to wifi, download SeriousMD and login with the secretary account. Make sure it syncs until it says "SeriousMD is up to Date"