Ability to actually delete (and download again later) tests in the app
I recommend including the ability to actually remove from the app all tests that are not desired. For example, if studying for Extra, the user should be able to co figure the app to see absolutely nothing except study for Extra. It appears the app in its current state forces the user to always keep unwanted tests available, which is totally illogical to me.
It uses less than 12MB of storage for data. If your device can’t handle that amount then you need to upgrade. Removing a test or two only saves a negligible amount of storage space.