For those Apple Native Apps, e.g. Garage Band, iMovie, Clips, you will need to ...

1)  Manually remove from the iPad.

2)  Purchase those Apple Native Apps from Apple School Manager with your VPP Account.

3)  Sync VPP App in ESP Admin Console.

4)  Install VPP App onto iPad.

For other Apps, go to "Device" > "Device Management" > "Bulk Action" > "Apps" > "Manage Apps" > Select Device(s) > Select App(s) > "Confirm".